PHYS 261 Human Physiology Combined Quizzes 1–4 | 2026/2027 | 160 Questions and Correct Answers | Complete Exam Material

PHYS 261 Human Physiology

Combined Quizzes 1–4 Exam Bank

160 Questions with Correct Answers


1. What is the most abundant fluid compartment in the body?

a) Plasma

b) Interstitial fluid

c) Intracellular fluid

d) Transcellular fluid



Answer: c) Intracellular fluid



2. Which feedback mechanism amplifies an initial change?

a) Negative feedback

b) Positive feedback

c) Feedforward control

d) Homeostatic inhibition

,Answer: b) Positive feedback



3. The Na+/K+ ATPase pump transports:

a) 3 Na+ out, 2 K+ in

b) 2 Na+ out, 3 K+ in

c) 3 Na+ in, 2 K+ out

d) 2 Na+ in, 3 K+ out



Answer: a) 3 Na+ out, 2 K+ in



4. Which organelle is responsible for ATP production?

a) Ribosome

b) Golgi apparatus

c) Mitochondrion

d) Lysosome



Answer: c) Mitochondrion



5. The resting membrane potential of a typical neuron is approximately:

a) +30 mV

b) 0 mV

, c) -70 mV

d) -90 mV



Answer: c) -70 mV



6. Diffusion requires:

a) ATP energy

b) A transport protein

c) A concentration gradient

d) Active transport



Answer: c) A concentration gradient



7. Which of the following is an example of negative feedback?

a) Childbirth contractions

b) Blood clotting

c) Regulation of body temperature

d) Action potential depolarization



Answer: c) Regulation of body temperature