Question 1

Which of the following best describes the difference between positive and negative feedback mechanisms in homeostasis?

Accepted Answer

Negative feedback reverses a change to maintain stability, while positive feedback enhances the change.

Question 2

Which of the following is an example of active transport in cells?

Accepted Answer

Sodium-potassium pump ($$\mathrm{Na^+/K^+}$$ pump)

Question 3

A patient is experiencing muscle weakness due to low extracellular potassium. Which cellular process is most directly affected?

Accepted Answer

Active transport via the $$\mathrm{Na^+/K^+}$$ pump

Question 4

Which tissue type is primarily responsible for lining organs and forming glands?

Accepted Answer

Epithelial tissue

Question 5

Which of the following is NOT a function of connective tissue?

Accepted Answer

Secretion of hormones

Question 6

During muscle contraction, which ion is primarily responsible for initiating the process by binding to troponin?

Accepted Answer

Calcium ($$\mathrm{Ca$$^{2+}$$})$$

Question 7

Which of the following best describes the difference between the central nervous system (CNS) and the peripheral nervous system (PNS)?

Accepted Answer

The CNS consists of the brain and spinal cord, while the PNS consists of nerves outside the CNS.

Question 8

Which part of the neuron is responsible for receiving incoming signals from other neurons?

Accepted Answer

Dendrite

Question 9

A patient has damage to the frontal lobe of the brain. Which function is most likely to be affected?

Accepted Answer

Decision making and voluntary movement

Question 10

Which of the following best explains the process of depolarization in a neuron?

Accepted Answer

Sodium ions ($$\mathrm{Na^+}) $$enter the cell, making the inside more positive.

Question 11

Which structure in the brain is primarily responsible for regulating heart rate and breathing?

Accepted Answer

Medulla oblongata

Question 12

Which of the following is TRUE regarding the gray and white matter in the spinal cord?

Accepted Answer

White matter contains myelinated axons, while gray matter contains cell bodies and dendrites.

Question 13

Which of the following best describes the role of the sarcomere in muscle contraction?

Accepted Answer

It is the contractile unit where actin and myosin filaments slide past each other.

Question 14

A patient is unable to move their right arm after a stroke. Which part of the brain is most likely affected?

Accepted Answer

Left frontal lobe

Question 15

Which of the following is a function of the autonomic nervous system (ANS)?

Accepted Answer

Regulation of heart rate and digestion

Question 16

Which neurotransmitter is released at the neuromuscular junction to stimulate muscle contraction?

Accepted Answer

Acetylcholine

Question 17

Which of the following best describes the difference between afferent and efferent neurons?

Accepted Answer

Afferent neurons carry sensory information to the CNS, efferent neurons carry motor commands away from the CNS.

Question 18

Which equation correctly represents the resting membrane potential of a neuron?

Accepted Answer

$$V_m = \frac{RT}{F} \ln \left( \frac{[K^+]_{out}}{[K^+]_{in}} \right)$$

Question 19

A patient presents with loss of sensation in the lower limbs. Which part of the spinal cord is most likely damaged?

Accepted Answer

Lumbar region

Question 20

Which of the following is TRUE about the sympathetic division of the autonomic nervous system?

Accepted Answer

It is responsible for the 'fight or flight' response.

Comprehensive Study Notes: Human Anatomy and Physiology I Final Exam Guide

Study Guide - Practice Questions