Question 1

Which of the following best describes the role of ATP in the sliding filament theory of muscle contraction?

Accepted Answer

ATP hydrolysis causes the myosin head to detach from actin and re-cock into a high-energy position.

Question 2

A patient suffers a stroke that damages the primary motor cortex. Which of the following symptoms would most likely result?

Accepted Answer

Inability to initiate voluntary movements on the contralateral side of the body.

Question 3

Which muscle is primarily responsible for flexion of the forearm at the elbow?

Accepted Answer

Biceps brachii

Question 4

During an isotonic contraction, which of the following occurs?

Accepted Answer

The muscle changes length while the tension remains constant.

Question 5

Which of the following best describes the function of the basal nuclei?

Accepted Answer

Coordination of voluntary motor movements and procedural learning

Question 6

Which structure in the sarcomere shortens during muscle contraction?

Accepted Answer

I band

Question 7

A neurotransmitter is released at the neuromuscular junction and binds to receptors on the muscle cell membrane. What is the immediate effect?

Accepted Answer

Depolarization of the muscle cell membrane

Question 8

Which of the following is a function of the hypothalamus?

Accepted Answer

Regulation of body temperature and hunger

Question 9

Which of the following best describes saltatory conduction?

Accepted Answer

Action potentials jump from one node of Ranvier to the next, increasing conduction speed.

Question 10

Which muscle group is responsible for knee extension?

Accepted Answer

Quadriceps femoris

Question 11

Which of the following is true regarding the lever systems in the human body?

Accepted Answer

Most skeletal muscles act as third-class levers, where the effort is applied between the fulcrum and the load.

Question 12

Which of the following best describes the function of the masseter muscle?

Accepted Answer

Elevates the mandible during chewing

Question 13

Which of the following statements about myelin is correct?

Accepted Answer

Myelin increases the speed of nerve impulse conduction.

Question 14

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

Accepted Answer

Acetylcholine

Question 15

Which of the following best describes the function of the arbor vitae?

Accepted Answer

It is the white matter of the cerebellum that coordinates motor control.

Question 16

A patient presents with difficulty breathing due to paralysis of a muscle involved in ventilation. Which muscle is most likely affected?

Accepted Answer

Diaphragm

Question 17

Which of the following is a characteristic of an isometric muscle contraction?

Accepted Answer

The muscle length remains the same while tension increases.

Question 18

Which of the following best describes the function of the limbic system?

Accepted Answer

Regulation of emotional responses and memory formation

Question 19

Which of the following is the correct sequence of events in muscle contraction?

Accepted Answer

Release of calcium, binding of myosin to actin, power stroke, detachment of myosin from actin

Question 20

Which of the following best describes the location of cerebrospinal fluid (CSF) in the brain?

Accepted Answer

Within the ventricles and subarachnoid space

Exam 3 Study Guide: Muscular and Nervous System (Anatomy & Physiology)

Study Guide - Practice Questions