$$E = \frac{RT}{zF} \ln \left( \frac{[\text{ion}]_{\text{outside}}}{[\text{ion}]_{\text{inside}}} \right)$$

Question 1

Which of the following best describes the difference between skeletal and smooth muscle contraction?

Accepted Answer

Skeletal muscle contraction is rapid and forceful, while smooth muscle contraction is slower and sustained.

Question 2

A patient presents with muscle weakness after repeated stimulation. Which process is most likely responsible for this phenomenon?

Accepted Answer

Depletion of acetylcholine at the neuromuscular junction.

Question 3

Which equation correctly represents the process of ATP generation during muscle metabolism?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 36\mathrm{ATP}$$

Question 4

Which of the following best explains why increasing the frequency of stimulation leads to greater muscle tension?

Accepted Answer

Increased stimulation frequency causes summation of twitches, leading to tetanus.

Question 5

Which structure in the neuron is primarily responsible for the propagation of the action potential?

Accepted Answer

Axon

Question 6

A patient has damage to the primary motor cortex. Which function is most likely to be impaired?

Accepted Answer

Initiating voluntary movements

Question 7

Which of the following best describes the role of the thalamus in the brain?

Accepted Answer

It acts as a relay station for sensory information to the cerebral cortex.

Question 8

Which neurotransmitter is primarily involved in the generation of excitatory postsynaptic potentials (EPSPs) in the central nervous system?

Accepted Answer

Glutamate

Question 9

Which of the following pathways carries fine touch and proprioceptive information to the brain?

Accepted Answer

Dorsal column-medial lemniscal pathway

Question 10

If the spinal cord is transected at the thoracic level, which of the following outcomes is most likely?

Accepted Answer

Loss of motor and sensory function below the level of injury

Question 11

Which equation best represents the Nernst equation for calculating the equilibrium potential of an ion?

Accepted Answer

$$E = \frac{RT}{zF} \ln \left( \frac{[	ext{ion}]_{	ext{outside}}}{[	ext{ion}]_{	ext{inside}}} ight)$$

Question 12

Which brain structure is primarily responsible for coordination and balance?

Accepted Answer

Cerebellum

Question 13

Which of the following best describes the function of the blood-brain barrier?

Accepted Answer

It selectively restricts the movement of certain substances from the blood into the brain.

Question 14

Which of the following is a direct (pyramidal) descending motor pathway?

Accepted Answer

Corticospinal tract

Question 15

Which of the following best explains the role of the hypothalamus in homeostasis?

Accepted Answer

It regulates body temperature, hunger, and hormone secretion.

Question 16

Which of the following is a function of the cerebrospinal fluid (CSF)?

Accepted Answer

Provides nutrients and removes waste from the brain.

Question 17

Which embryonic brain structure gives rise to the cerebrum?

Accepted Answer

Telencephalon

Question 18

Which of the following best describes the difference between depolarization and hyperpolarization in a neuron?

Accepted Answer

Depolarization makes the membrane potential less negative, while hyperpolarization makes it more negative.

Question 19

Which of the following is a function of the basal nuclei?

Accepted Answer

Regulation of voluntary motor movements and procedural learning

Question 20

Which equation best represents the formula for cardiac output?

Accepted Answer

$$	ext{Cardiac Output} = 	ext{Stroke Volume} 	imes 	ext{Heart Rate}$$

Anatomy & Physiology: Study Guide for Muscle and Nervous System

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