WCU Phys 261 Midterm Exam - Human Physiology
Practice Questions And Answers 2026/2027 Exam |
Complete Questions And Answers (Verified Answers) |
Exam Prep | Comprehensive Exam Guide 2026&2027
1. Which statement best describes the primary goal of human physiology?
A. To identify the structural abnormalities of organs
B. To explain how body structures function and interact
C. To classify tissues according to microscopic appearance
D. To identify the evolutionary origins of human organs
Answer: B
Physiology focuses on how living structures function. It examines mechanisms at cellular,
tissue, organ, and system levels and how these mechanisms interact to maintain normal body
function.
2. A student measures a person's body temperature before and after exercise. Which
physiological principle is most directly demonstrated when body temperature returns
toward normal after exercise?
A. Positive feedback
B. Feedforward control
C. Homeostasis
D. Structural organization
Answer: C
Homeostasis refers to the body's ability to maintain relatively stable internal conditions
despite external or internal changes. Returning body temperature toward its normal range is
a classic example.
3. Which component of a homeostatic control system detects a change in the internal
environment?
A. Receptor
B. Effector
C. Control center
D. Response
Answer: A
,The receptor or sensor detects a deviation from a regulated variable and communicates
information to the control center for appropriate processing.
4. A person becomes overheated while exercising. The hypothalamus detects the increase in
body temperature and activates mechanisms that promote heat loss. What role does the
hypothalamus play?
A. Effector
B. Receptor
C. Stimulus
D. Control center
Answer: D
The hypothalamus functions as a major thermoregulatory control center. It receives
information about body temperature and coordinates appropriate responses.
5. Which example best illustrates positive feedback?
A. Sweating when body temperature rises
B. Insulin secretion after an increase in blood glucose
C. Uterine contractions intensifying during labor
D. Increased breathing after carbon dioxide rises
Answer: C
Positive feedback amplifies the original stimulus. During labor, uterine contractions promote
oxytocin release, which strengthens contractions and further promotes the process.
6. A researcher observes that increasing one variable consistently causes a proportional
increase in another variable. Which type of relationship is being described?
A. Direct relationship
B. Inverse relationship
C. Negative feedback
D. Threshold response
Answer: A
In a direct relationship, two variables change in the same direction. As one increases, the
other also increases under the conditions being studied.
7. Which level of organization represents the smallest living unit capable of carrying out all
basic life processes?
,A. Tissue
B. Cell
C. Organ
D. Organ system
Answer: B
The cell is the basic structural and functional unit of the human body. Specialized cells
perform specific functions while maintaining essential life processes.
8. A group of similar cells performs a common function. What level of organization does
this represent?
A. Organ system
B. Organ
C. Tissue
D. Organism
Answer: C
A tissue consists of groups of specialized cells and their surrounding materials that work
together to perform one or more related functions.
9. Which organelle is primarily responsible for producing ATP through aerobic cellular
respiration?
A. Ribosome
B. Lysosome
C. Golgi apparatus
D. Mitochondrion
Answer: D
Mitochondria generate most cellular ATP through oxidative metabolism. ATP provides usable
energy for many cellular processes.
10. A cell contains a membrane that selectively regulates movement of substances between
the intracellular and extracellular environments. Which structure performs this function?
A. Plasma membrane
B. Nucleolus
C. Cytoskeleton
D. Nuclear envelope
Answer: A
, The plasma membrane forms a selective barrier around the cell and regulates movement of
ions, nutrients, waste products, and other substances.
11. Which substance can generally cross the phospholipid bilayer most readily by simple
diffusion?
A. Sodium ion
B. Glucose
C. Oxygen
D. Large protein
Answer: C
Small nonpolar molecules such as oxygen can diffuse through the hydrophobic interior of the
phospholipid bilayer without requiring membrane transport proteins.
12. A red blood cell is placed into a solution with a lower solute concentration than its
cytoplasm. What will most likely happen?
A. It will shrink because water leaves the cell
B. It will remain unchanged
C. It will lose all intracellular sodium
D. It will swell because water enters the cell
Answer: D
The surrounding hypotonic solution has a lower effective solute concentration, causing water
to move into the cell by osmosis. The red blood cell may eventually rupture.
13. Which process requires cellular energy to move a substance against its concentration
gradient?
A. Simple diffusion
B. Active transport
C. Filtration
D. Osmosis
Answer: B
Active transport uses energy, commonly ATP, to move substances against their
electrochemical or concentration gradients.
14. Sodium-potassium pumps move sodium and potassium ions across the plasma
membrane. Which statement correctly describes this pump?
Practice Questions And Answers 2026/2027 Exam |
Complete Questions And Answers (Verified Answers) |
Exam Prep | Comprehensive Exam Guide 2026&2027
1. Which statement best describes the primary goal of human physiology?
A. To identify the structural abnormalities of organs
B. To explain how body structures function and interact
C. To classify tissues according to microscopic appearance
D. To identify the evolutionary origins of human organs
Answer: B
Physiology focuses on how living structures function. It examines mechanisms at cellular,
tissue, organ, and system levels and how these mechanisms interact to maintain normal body
function.
2. A student measures a person's body temperature before and after exercise. Which
physiological principle is most directly demonstrated when body temperature returns
toward normal after exercise?
A. Positive feedback
B. Feedforward control
C. Homeostasis
D. Structural organization
Answer: C
Homeostasis refers to the body's ability to maintain relatively stable internal conditions
despite external or internal changes. Returning body temperature toward its normal range is
a classic example.
3. Which component of a homeostatic control system detects a change in the internal
environment?
A. Receptor
B. Effector
C. Control center
D. Response
Answer: A
,The receptor or sensor detects a deviation from a regulated variable and communicates
information to the control center for appropriate processing.
4. A person becomes overheated while exercising. The hypothalamus detects the increase in
body temperature and activates mechanisms that promote heat loss. What role does the
hypothalamus play?
A. Effector
B. Receptor
C. Stimulus
D. Control center
Answer: D
The hypothalamus functions as a major thermoregulatory control center. It receives
information about body temperature and coordinates appropriate responses.
5. Which example best illustrates positive feedback?
A. Sweating when body temperature rises
B. Insulin secretion after an increase in blood glucose
C. Uterine contractions intensifying during labor
D. Increased breathing after carbon dioxide rises
Answer: C
Positive feedback amplifies the original stimulus. During labor, uterine contractions promote
oxytocin release, which strengthens contractions and further promotes the process.
6. A researcher observes that increasing one variable consistently causes a proportional
increase in another variable. Which type of relationship is being described?
A. Direct relationship
B. Inverse relationship
C. Negative feedback
D. Threshold response
Answer: A
In a direct relationship, two variables change in the same direction. As one increases, the
other also increases under the conditions being studied.
7. Which level of organization represents the smallest living unit capable of carrying out all
basic life processes?
,A. Tissue
B. Cell
C. Organ
D. Organ system
Answer: B
The cell is the basic structural and functional unit of the human body. Specialized cells
perform specific functions while maintaining essential life processes.
8. A group of similar cells performs a common function. What level of organization does
this represent?
A. Organ system
B. Organ
C. Tissue
D. Organism
Answer: C
A tissue consists of groups of specialized cells and their surrounding materials that work
together to perform one or more related functions.
9. Which organelle is primarily responsible for producing ATP through aerobic cellular
respiration?
A. Ribosome
B. Lysosome
C. Golgi apparatus
D. Mitochondrion
Answer: D
Mitochondria generate most cellular ATP through oxidative metabolism. ATP provides usable
energy for many cellular processes.
10. A cell contains a membrane that selectively regulates movement of substances between
the intracellular and extracellular environments. Which structure performs this function?
A. Plasma membrane
B. Nucleolus
C. Cytoskeleton
D. Nuclear envelope
Answer: A
, The plasma membrane forms a selective barrier around the cell and regulates movement of
ions, nutrients, waste products, and other substances.
11. Which substance can generally cross the phospholipid bilayer most readily by simple
diffusion?
A. Sodium ion
B. Glucose
C. Oxygen
D. Large protein
Answer: C
Small nonpolar molecules such as oxygen can diffuse through the hydrophobic interior of the
phospholipid bilayer without requiring membrane transport proteins.
12. A red blood cell is placed into a solution with a lower solute concentration than its
cytoplasm. What will most likely happen?
A. It will shrink because water leaves the cell
B. It will remain unchanged
C. It will lose all intracellular sodium
D. It will swell because water enters the cell
Answer: D
The surrounding hypotonic solution has a lower effective solute concentration, causing water
to move into the cell by osmosis. The red blood cell may eventually rupture.
13. Which process requires cellular energy to move a substance against its concentration
gradient?
A. Simple diffusion
B. Active transport
C. Filtration
D. Osmosis
Answer: B
Active transport uses energy, commonly ATP, to move substances against their
electrochemical or concentration gradients.
14. Sodium-potassium pumps move sodium and potassium ions across the plasma
membrane. Which statement correctly describes this pump?
