BIOL251 Human Anatomy & Physiology I w/Lab
2026 | Module 6 Exam Review |70+ Questions and
Answers Summary |Lock Down Browser |Portage
Learning
What is homeostasis?
the ability to maintain a relatively stable internal environment in an ever-
changing outside world
What are control mechanisms for homeostasis?
3 components -- the receptor is a sensor that monitors the environment
and responds to changes, called stimuli and then sends info to the
control center where it is analyzed and determines the appropriate
response or course of action (determines the set point - the level that
must be maintained) and then the info flows to the effector which
provides the means for the control centers response to the stimulus
(output). The results of the response then feed back to influence the
effect of the stimulus by either reducing it (negative feedback) or
enhancing it (positive feedback)
What is negative feedback within homeostasis? and example
the response reduces or shuts off the original stimulus regulation of body
temp (nervous mechanism) regulation of blood sugar (endocrine
mechanism)
,What separates living beings from nonliving objects?
Living organisms are able to maintain their boundaries, move, respond to
environmental change, digest nutrients, carry out metabolism, dispose of
wastes, reproduce and grow. while inanimate objects do not exhibit all of
these
What name is given to all chemical reactions that occur within body cells
metabolism
Why is it necessary to be in a pressurized cabin when flying at 30,000
feet?
because the atmosphere is thinner at high altitudes and the amount of
oxygen entering the blood under such conditions may be insufficient to
maintain life
What's the process of negative back for regulation of blood volume by
ADH
Receptors sense decreased blood volume, control center in
hypothalamus stimulates pituitary gland to release antidiuretic hormone
ADH, ADH causes the kidneys (effectors) to return more water to the
blood.
What is positive feedback examples
the response enhances, exaggerates or accelerates the original stimulus
(cascades); exhibits an amplifying effect; usually controls infrequent
events ex: enhancement of labor contractions by oxytocin, platelet plug
formation and blood clotting
, Homeostatic imbalance is the ...what does this cause?
disturbance of homeostasis increases risk of disease, contributes to
changes associated with aging, may allow destructive positive feedback
mechanisms to take over (heart failure)
Frontal Planes (Coronal Plane)
like sagittal plane lie vertically, divide body into anterior and posterior
parts
Transverse/Horizontal Plane
runs horizontally from right to left, dividing the body into superior and
inferior parts. (Transverse is perpendicular to long axis of an organ,
horizontal is from front to back)
Oblique Sections
cuts made diagonally between the horizontal and the vertical planes
Dorsal Body Cavity
protects the fragile nervous system organs, has 2 subdivisions
2026 | Module 6 Exam Review |70+ Questions and
Answers Summary |Lock Down Browser |Portage
Learning
What is homeostasis?
the ability to maintain a relatively stable internal environment in an ever-
changing outside world
What are control mechanisms for homeostasis?
3 components -- the receptor is a sensor that monitors the environment
and responds to changes, called stimuli and then sends info to the
control center where it is analyzed and determines the appropriate
response or course of action (determines the set point - the level that
must be maintained) and then the info flows to the effector which
provides the means for the control centers response to the stimulus
(output). The results of the response then feed back to influence the
effect of the stimulus by either reducing it (negative feedback) or
enhancing it (positive feedback)
What is negative feedback within homeostasis? and example
the response reduces or shuts off the original stimulus regulation of body
temp (nervous mechanism) regulation of blood sugar (endocrine
mechanism)
,What separates living beings from nonliving objects?
Living organisms are able to maintain their boundaries, move, respond to
environmental change, digest nutrients, carry out metabolism, dispose of
wastes, reproduce and grow. while inanimate objects do not exhibit all of
these
What name is given to all chemical reactions that occur within body cells
metabolism
Why is it necessary to be in a pressurized cabin when flying at 30,000
feet?
because the atmosphere is thinner at high altitudes and the amount of
oxygen entering the blood under such conditions may be insufficient to
maintain life
What's the process of negative back for regulation of blood volume by
ADH
Receptors sense decreased blood volume, control center in
hypothalamus stimulates pituitary gland to release antidiuretic hormone
ADH, ADH causes the kidneys (effectors) to return more water to the
blood.
What is positive feedback examples
the response enhances, exaggerates or accelerates the original stimulus
(cascades); exhibits an amplifying effect; usually controls infrequent
events ex: enhancement of labor contractions by oxytocin, platelet plug
formation and blood clotting
, Homeostatic imbalance is the ...what does this cause?
disturbance of homeostasis increases risk of disease, contributes to
changes associated with aging, may allow destructive positive feedback
mechanisms to take over (heart failure)
Frontal Planes (Coronal Plane)
like sagittal plane lie vertically, divide body into anterior and posterior
parts
Transverse/Horizontal Plane
runs horizontally from right to left, dividing the body into superior and
inferior parts. (Transverse is perpendicular to long axis of an organ,
horizontal is from front to back)
Oblique Sections
cuts made diagonally between the horizontal and the vertical planes
Dorsal Body Cavity
protects the fragile nervous system organs, has 2 subdivisions
