Unlocking the Body: A Comprehensive Guide to
Chapters 1-4 of Anatomy and Physiology
An Ultimate Guide to Exam Study Guide Latest
Updated 2025/2026.
100% Certified Study Guide by Experts.
Anatomy - ANSthe study of the structure of the body
Physiology - ANSthe study of the function of the body
Chemical level - ANSrepresents the atoms and molecules that make up cells (Consists of
Atomic level and molecular level)
Cellular level - ANSrepresents the basic unit of all living things
Tissue level - ANSa group of cells with similar or common function
Organ level - ANSa group of tissues with similar or common function
Organ system level - ANSa group of organs with similar or common function
Organismic level - ANSthe entire body consisting of the various organ systems.
Integumentary System - ANScontrols body temperature & protects body from environmental
hazards
Skeletal System - ANSsupports body, protects soft body parts, stores minerals, forms blood
cells
Muscular System - ANSmovement, support and produces heat
Nervous System - ANScontrols immediate responses to stimuli
Endocrine System - ANScontrols long-term responses in body
Cardiovascular System - ANSinternal transport of nutrients, wastes, oxygen, carbon dioxide
and cells
Lymphatic & Immune Systems - ANSdefense, immunity and returns lost fluids to
cardiovascular system
Respiratory System - ANSexchange of air and delivery of blood gases to/from tissues
Digestive System - ANSingestion, breakdown and absorption of food & elimination of
indigestible wastes
Urinary System - ANSfiltration of blood to maintain proper water and salt balance and to
eliminate waste products
Reproductive System - ANSproduces sex cells and hormones related to reproduction
homeostasis - ANScondition in which body's internal environment remains within certain
narrow physiological limits
homeostatic regulation - ANSadjustment of physiological system to maintain homeostasis
receptor - ANSmonitors change in controlled condition (stimulus) and sends input to control
center
control (integration) center - ANSreceives input from receptor & determines appropriate
response
effector - ANScell or organ that receives information (output) from control center and
produces a response (effect)
interactions of a feedback system - ANSstimulus -> receptor -> input (afferent pathway) ->
control center -> output (efferent pathway) -> response
positive feedback - ANSthe response by the effector to the initial change is to further
exaggerate the change. Example in labor contractions, the contraction of the uterus forces the
baby towards the birth canal, which
places pressure on the cervix; the pressure of the baby against the cervix causes uterine
contraction, etc. - ANS...
Negative feedback - ANSthe response by the effector to the initial change is to counter or
reduce that change, thus bringing the system back to its "normal" state. Example When blood
sugar level rises, the pancreas secretes
,Unlocking the Body: A Comprehensive Guide to
Chapters 1-4 of Anatomy and Physiology
An Ultimate Guide to Exam Study Guide Latest
Updated 2025/2026.
100% Certified Study Guide by Experts.
insulin which causes the cells of the body to take in glucose, thus removing glucose from the
blood and lowering blood sugar level. - ANS...
Anatomical position - ANSpatient is erect, feet apart and palms facing anteriorly Cephalic =
head
Cranial - ANSupper portion of head surrounding brain
Facial - ANSface
cervical - ANSneck
thoracic - ANSchest
axillary - ANSarmpit
acromial - ANSpoint of shoulder
deltoid - ANSfleshy portion of shoulder
brachial - ANSupper arm
antebrachial - ANSforearm
antecubital - ANSfront of elbow
carpal - ANSwrist
manual - ANShand
digital (phalangeal) - ANSfingers or toes
abdominal - ANSregion of trunk between diaphragm and pelvis
dorsal - ANSback
lumbar - ANSlower back
olecranol - ANSback of elbow
pelvic - ANSpelvis
pubic - ANSanterior pelvis
inguinal - ANSjunction of trunk and thighs (groin)
gluteal - ANSbuttocks
femoral - ANSthigh
patellar - ANSfront of knee
popliteal - ANSback of knee
crural - ANSanterior of lower leg (shin)
sural - ANSposterior of lower leg (calf)
tarsal - ANSankle
pedal - ANSfoot
plantar - ANSbottom of foot
superior ( - ANScephalic = cranial) = towards the head
inferior ( - ANScaudal) = away from the head
anterior (ventral) - ANStowards the front
posterior (dorsal) - ANStowards the back
medial - ANStowards the midline
lateral - ANSaway from the midline
proximal - ANStowards the point of attachment (limbs)
distal - ANSaway from the point of attachment (limbs)
superficial - ANStowards the surface (i.e., skin)
deep - ANSaway from the surface
Sagittal - ANSseparates the body into right and left parts
Midsaggital - ANSmedian = separates the body into equal right and left parts
Parasaggital - ANSseparates the body into unequal right and left parts
,Unlocking the Body: A Comprehensive Guide to
Chapters 1-4 of Anatomy and Physiology
An Ultimate Guide to Exam Study Guide Latest
Updated 2025/2026.
100% Certified Study Guide by Experts.
Frontal - ANScoronal = separates the body into anterior and posterior parts
Transverse - ANShorizontal - cross-sectional -separates the body into superior and inferior
parts
. - ANS...
dorsal body - ANSThe two major cavities of the body are the dorsal body cavity and the
ventral body cavity.
ventral body - ANSThe organs in the ventral body cavity are surrounded by serous
membranes which allow for organ movement. There are no serous membranes in he dorsal
body cavity.
The dorsal body cavity - ANSsurrounds the brain and spinal cord.
It is separated into two subdivisions - ANSthe cranial cavity surrounds the brain and the
spinal cavity surrounds the spinal cord.
The ventral body cavity - ANSincludes the thoracic cavity and the abdominopelvic cavity.
The thoracic cavity - ANSis the cavity superior to the diaphragm and the abdominopelvic
cavity is inferior to the diaphragm.
The thoracic cavity is further subdivided into - ANStwo pleural cavities, which contain the
lungs, one pericardial cavity, which contains the
heart, and the mediastinum, which is the central region of the thoracic cavity containing the
esophagus and trachea. - ANS...
The abdominopelvic cavity - ANSis separated into two regions, which are not truly separated
from one another in the
body. - ANS...
These are the abdominal cavity, - ANSwhich contains primarily the digestive organs and the
pelvic cavity, which contains primarily the reproductive and urinary organs.
Serous membranes (also called serosae) - ANSare found within the ventral body cavity. They
consist of two layers of membrane with fluid =(called serous fluid) in between the two layers.
The inner layer - ANSwhich is closest to the organ, is
called the visceral layer. - ANS...
The outer layer - ANSwhich is closest to the body wall, is called the parietal layer.
Pleura - ANSserous membranes surrounding lungs
parietal pleura - ANSouter serous membrane surrounding lungs
visceral pleura - ANSinner serous membrane surrounding lungs
Pericardium - ANSserous membranes surrounding heart
parietal percardium - ANSouter serous membrane surrounding heart
visceral pericardium - ANSinner serous membrane surrounding heart
Peritoneum - ANSserous membranes lining organs in the abdominopelvic cavity
(surrounding digestive, reproductive and
urinary organs) - ANS...
parietal peritoneum - ANSouter serous membrane surrounding organs in the abdominopelvic
region
visceral peritoneum - ANSinner serous membrane surrounding organs in the abdominopelvic
region
Imagine drawing a cross in the abdominopelvic region with the lines intersecting at the
umbilicus. These represent the quadrants. Remember when naming the quadrants and regions
that right and left refer to the patient's right and left. The quadrants are as follows - ANS...
Right Upper Quadrant Left Upper Quadrant - ANS...
, Unlocking the Body: A Comprehensive Guide to
Chapters 1-4 of Anatomy and Physiology
An Ultimate Guide to Exam Study Guide Latest
Updated 2025/2026.
100% Certified Study Guide by Experts.
Right Lower Quadrant Left Lower Quadrant - ANS...
Now imagine drawing a "tic tac toe" in the abdominopelvic region with the umbilicus in the
center of the middle square. The nine regions are as follows - ANS...
Right Hypochondriac Epigastric Left Hypochondriac - ANS...
Right Lumbar Umbilical Left Lumbar - ANS...
Right Iliac Hypogastric Left Iliac - ANS...
oral - ANScavity of mouth
digestive - ANScavity inside the digestive tract
nasal - ANScavity inside nose
orbital - ANScavity around eyes
middle ear - ANScavity between eardrum and inner ear
synovial - ANScavity surrounding some types of joints
Matter - ANSis anything that occupies space and has mass.
The three states of matter are - ANSsolid, liquid and gas.
How do they differ from each other - ANSThey differ from one another primarily in the
distance between molecules and the motion of molecules.
In gases - ANSmolecules are far apart there is a lot of motion.
Liquids - ANShave less movement of molecules and shorter distances between molecules
than gases.
Solids - ANShave less movement of molecules and shorter distances between molecules than
liquids.
Element - ANSbuilding blocks of matter; each element is unique in its atomic structure and
has its own unique properties
Atom - ANSbuilding blocks or basic units of elements
Subatomic particle - ANSthe particles that make up an atom; i.e., protons, neutrons and
electrons
Proton - ANSpositively charged subatomic particle that resides in the nucleus of an atom
neutron - ANSuncharged subatomic particle that resides in the nucleus of an atom
electron - ANSnegatively charged subatomic particle that resides in the energy levels (shells)
of an atom
Ionic bonds - ANSoccur when one atoms gives electron(s) to another atom. When electrons
are transferred, the atom that loses electrons becomes a cation and the atom that gains
electrons becomes an anion. The two atoms are then attracted to one another due the
attraction of opposite charges.
Covalent bonds - ANSoccur when two atoms share electrons. Because they share electrons,
the two atoms are held together.
Polar covalent bonds - ANSare bonds where electrons are shared unequally. As a result, one
side becomes slightly positively charged and the other side becomes slightly negatively
charged (and we call this polar).
Nonpolar covalent bonds - ANSare bonds where electrons are shared equally; there is no
separation of charge.
Single covalent bonds - ANStwo atoms share 1 pair of electrons
Double covalent bonds - ANStwo atoms share 2 pair of electrons
Triple covalent bonds - ANStwo atoms share 3 pair of electrons
A hydrogen bond is - ANSa weak attraction between hydrogen of one molecule (or section of
molecule) and the oxygen or nitrogen of one molecule (or section of molecule). Rather than
Chapters 1-4 of Anatomy and Physiology
An Ultimate Guide to Exam Study Guide Latest
Updated 2025/2026.
100% Certified Study Guide by Experts.
Anatomy - ANSthe study of the structure of the body
Physiology - ANSthe study of the function of the body
Chemical level - ANSrepresents the atoms and molecules that make up cells (Consists of
Atomic level and molecular level)
Cellular level - ANSrepresents the basic unit of all living things
Tissue level - ANSa group of cells with similar or common function
Organ level - ANSa group of tissues with similar or common function
Organ system level - ANSa group of organs with similar or common function
Organismic level - ANSthe entire body consisting of the various organ systems.
Integumentary System - ANScontrols body temperature & protects body from environmental
hazards
Skeletal System - ANSsupports body, protects soft body parts, stores minerals, forms blood
cells
Muscular System - ANSmovement, support and produces heat
Nervous System - ANScontrols immediate responses to stimuli
Endocrine System - ANScontrols long-term responses in body
Cardiovascular System - ANSinternal transport of nutrients, wastes, oxygen, carbon dioxide
and cells
Lymphatic & Immune Systems - ANSdefense, immunity and returns lost fluids to
cardiovascular system
Respiratory System - ANSexchange of air and delivery of blood gases to/from tissues
Digestive System - ANSingestion, breakdown and absorption of food & elimination of
indigestible wastes
Urinary System - ANSfiltration of blood to maintain proper water and salt balance and to
eliminate waste products
Reproductive System - ANSproduces sex cells and hormones related to reproduction
homeostasis - ANScondition in which body's internal environment remains within certain
narrow physiological limits
homeostatic regulation - ANSadjustment of physiological system to maintain homeostasis
receptor - ANSmonitors change in controlled condition (stimulus) and sends input to control
center
control (integration) center - ANSreceives input from receptor & determines appropriate
response
effector - ANScell or organ that receives information (output) from control center and
produces a response (effect)
interactions of a feedback system - ANSstimulus -> receptor -> input (afferent pathway) ->
control center -> output (efferent pathway) -> response
positive feedback - ANSthe response by the effector to the initial change is to further
exaggerate the change. Example in labor contractions, the contraction of the uterus forces the
baby towards the birth canal, which
places pressure on the cervix; the pressure of the baby against the cervix causes uterine
contraction, etc. - ANS...
Negative feedback - ANSthe response by the effector to the initial change is to counter or
reduce that change, thus bringing the system back to its "normal" state. Example When blood
sugar level rises, the pancreas secretes
,Unlocking the Body: A Comprehensive Guide to
Chapters 1-4 of Anatomy and Physiology
An Ultimate Guide to Exam Study Guide Latest
Updated 2025/2026.
100% Certified Study Guide by Experts.
insulin which causes the cells of the body to take in glucose, thus removing glucose from the
blood and lowering blood sugar level. - ANS...
Anatomical position - ANSpatient is erect, feet apart and palms facing anteriorly Cephalic =
head
Cranial - ANSupper portion of head surrounding brain
Facial - ANSface
cervical - ANSneck
thoracic - ANSchest
axillary - ANSarmpit
acromial - ANSpoint of shoulder
deltoid - ANSfleshy portion of shoulder
brachial - ANSupper arm
antebrachial - ANSforearm
antecubital - ANSfront of elbow
carpal - ANSwrist
manual - ANShand
digital (phalangeal) - ANSfingers or toes
abdominal - ANSregion of trunk between diaphragm and pelvis
dorsal - ANSback
lumbar - ANSlower back
olecranol - ANSback of elbow
pelvic - ANSpelvis
pubic - ANSanterior pelvis
inguinal - ANSjunction of trunk and thighs (groin)
gluteal - ANSbuttocks
femoral - ANSthigh
patellar - ANSfront of knee
popliteal - ANSback of knee
crural - ANSanterior of lower leg (shin)
sural - ANSposterior of lower leg (calf)
tarsal - ANSankle
pedal - ANSfoot
plantar - ANSbottom of foot
superior ( - ANScephalic = cranial) = towards the head
inferior ( - ANScaudal) = away from the head
anterior (ventral) - ANStowards the front
posterior (dorsal) - ANStowards the back
medial - ANStowards the midline
lateral - ANSaway from the midline
proximal - ANStowards the point of attachment (limbs)
distal - ANSaway from the point of attachment (limbs)
superficial - ANStowards the surface (i.e., skin)
deep - ANSaway from the surface
Sagittal - ANSseparates the body into right and left parts
Midsaggital - ANSmedian = separates the body into equal right and left parts
Parasaggital - ANSseparates the body into unequal right and left parts
,Unlocking the Body: A Comprehensive Guide to
Chapters 1-4 of Anatomy and Physiology
An Ultimate Guide to Exam Study Guide Latest
Updated 2025/2026.
100% Certified Study Guide by Experts.
Frontal - ANScoronal = separates the body into anterior and posterior parts
Transverse - ANShorizontal - cross-sectional -separates the body into superior and inferior
parts
. - ANS...
dorsal body - ANSThe two major cavities of the body are the dorsal body cavity and the
ventral body cavity.
ventral body - ANSThe organs in the ventral body cavity are surrounded by serous
membranes which allow for organ movement. There are no serous membranes in he dorsal
body cavity.
The dorsal body cavity - ANSsurrounds the brain and spinal cord.
It is separated into two subdivisions - ANSthe cranial cavity surrounds the brain and the
spinal cavity surrounds the spinal cord.
The ventral body cavity - ANSincludes the thoracic cavity and the abdominopelvic cavity.
The thoracic cavity - ANSis the cavity superior to the diaphragm and the abdominopelvic
cavity is inferior to the diaphragm.
The thoracic cavity is further subdivided into - ANStwo pleural cavities, which contain the
lungs, one pericardial cavity, which contains the
heart, and the mediastinum, which is the central region of the thoracic cavity containing the
esophagus and trachea. - ANS...
The abdominopelvic cavity - ANSis separated into two regions, which are not truly separated
from one another in the
body. - ANS...
These are the abdominal cavity, - ANSwhich contains primarily the digestive organs and the
pelvic cavity, which contains primarily the reproductive and urinary organs.
Serous membranes (also called serosae) - ANSare found within the ventral body cavity. They
consist of two layers of membrane with fluid =(called serous fluid) in between the two layers.
The inner layer - ANSwhich is closest to the organ, is
called the visceral layer. - ANS...
The outer layer - ANSwhich is closest to the body wall, is called the parietal layer.
Pleura - ANSserous membranes surrounding lungs
parietal pleura - ANSouter serous membrane surrounding lungs
visceral pleura - ANSinner serous membrane surrounding lungs
Pericardium - ANSserous membranes surrounding heart
parietal percardium - ANSouter serous membrane surrounding heart
visceral pericardium - ANSinner serous membrane surrounding heart
Peritoneum - ANSserous membranes lining organs in the abdominopelvic cavity
(surrounding digestive, reproductive and
urinary organs) - ANS...
parietal peritoneum - ANSouter serous membrane surrounding organs in the abdominopelvic
region
visceral peritoneum - ANSinner serous membrane surrounding organs in the abdominopelvic
region
Imagine drawing a cross in the abdominopelvic region with the lines intersecting at the
umbilicus. These represent the quadrants. Remember when naming the quadrants and regions
that right and left refer to the patient's right and left. The quadrants are as follows - ANS...
Right Upper Quadrant Left Upper Quadrant - ANS...
, Unlocking the Body: A Comprehensive Guide to
Chapters 1-4 of Anatomy and Physiology
An Ultimate Guide to Exam Study Guide Latest
Updated 2025/2026.
100% Certified Study Guide by Experts.
Right Lower Quadrant Left Lower Quadrant - ANS...
Now imagine drawing a "tic tac toe" in the abdominopelvic region with the umbilicus in the
center of the middle square. The nine regions are as follows - ANS...
Right Hypochondriac Epigastric Left Hypochondriac - ANS...
Right Lumbar Umbilical Left Lumbar - ANS...
Right Iliac Hypogastric Left Iliac - ANS...
oral - ANScavity of mouth
digestive - ANScavity inside the digestive tract
nasal - ANScavity inside nose
orbital - ANScavity around eyes
middle ear - ANScavity between eardrum and inner ear
synovial - ANScavity surrounding some types of joints
Matter - ANSis anything that occupies space and has mass.
The three states of matter are - ANSsolid, liquid and gas.
How do they differ from each other - ANSThey differ from one another primarily in the
distance between molecules and the motion of molecules.
In gases - ANSmolecules are far apart there is a lot of motion.
Liquids - ANShave less movement of molecules and shorter distances between molecules
than gases.
Solids - ANShave less movement of molecules and shorter distances between molecules than
liquids.
Element - ANSbuilding blocks of matter; each element is unique in its atomic structure and
has its own unique properties
Atom - ANSbuilding blocks or basic units of elements
Subatomic particle - ANSthe particles that make up an atom; i.e., protons, neutrons and
electrons
Proton - ANSpositively charged subatomic particle that resides in the nucleus of an atom
neutron - ANSuncharged subatomic particle that resides in the nucleus of an atom
electron - ANSnegatively charged subatomic particle that resides in the energy levels (shells)
of an atom
Ionic bonds - ANSoccur when one atoms gives electron(s) to another atom. When electrons
are transferred, the atom that loses electrons becomes a cation and the atom that gains
electrons becomes an anion. The two atoms are then attracted to one another due the
attraction of opposite charges.
Covalent bonds - ANSoccur when two atoms share electrons. Because they share electrons,
the two atoms are held together.
Polar covalent bonds - ANSare bonds where electrons are shared unequally. As a result, one
side becomes slightly positively charged and the other side becomes slightly negatively
charged (and we call this polar).
Nonpolar covalent bonds - ANSare bonds where electrons are shared equally; there is no
separation of charge.
Single covalent bonds - ANStwo atoms share 1 pair of electrons
Double covalent bonds - ANStwo atoms share 2 pair of electrons
Triple covalent bonds - ANStwo atoms share 3 pair of electrons
A hydrogen bond is - ANSa weak attraction between hydrogen of one molecule (or section of
molecule) and the oxygen or nitrogen of one molecule (or section of molecule). Rather than
