Question 1

Which of the following best describes the difference between skeletal, cardiac, and smooth muscle cells?

Accepted Answer

Skeletal muscle cells are striated and voluntary, cardiac muscle cells are striated and involuntary, and smooth muscle cells are non-striated and involuntary.

Question 2

A patient presents with difficulty flexing their forearm. Which muscle is most likely affected?

Accepted Answer

Biceps brachii

Question 3

Which structure is responsible for the propagation of action potentials along the muscle fiber and is represented by the equation $$V = IR$$?

Accepted Answer

T tubules

Question 4

During muscle contraction, which band in the sarcomere does NOT change length?

Accepted Answer

A band

Question 5

Which of the following best describes the function of the neuromuscular junction?

Accepted Answer

It is the site where a motor neuron communicates with a muscle fiber to initiate contraction.

Question 6

A patient is unable to abduct their arm at the shoulder. Which muscle is most likely impaired?

Accepted Answer

Deltoid

Question 7

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

Accepted Answer

Triceps brachii

Question 8

Which of the following is the correct origin and insertion for the sternocleidomastoid muscle?

Accepted Answer

Origin: clavicle and sternum; Insertion: mastoid process of temporal bone

Question 9

Which muscle group is responsible for flexing the thigh at the hip joint?

Accepted Answer

Iliopsoas

Question 10

Which of the following best describes the role of myosin and actin in muscle contraction?

Accepted Answer

Myosin heads bind to actin filaments, forming cross-bridges that pull actin toward the center of the sarcomere.

Question 11

Which equation best represents the relationship between force, cross-sectional area, and muscle tension?

Accepted Answer

$$F = \sigma 	imes A$$

Question 12

A patient with damage to the phrenic nerve would have difficulty with which muscle function?

Accepted Answer

Breathing due to impaired diaphragm contraction

Question 13

Which muscle is primarily responsible for the movement of the eyebrows and forehead?

Accepted Answer

Frontalis

Question 14

Which of the following best describes the function of the central nervous system?

Accepted Answer

It integrates sensory information and coordinates motor output.

Question 15

Which muscle group is responsible for extending the leg at the knee joint?

Accepted Answer

Quadriceps femoris

Question 16

Which of the following is a function of neuroglia in the nervous system?

Accepted Answer

Support and protect neurons

Question 17

A patient is unable to extend their arm at the shoulder joint. Which muscle is most likely affected?

Accepted Answer

Latissimus dorsi

Question 18

Which equation best represents the relationship between nerve conduction velocity, distance, and time?

Accepted Answer

$$v = \frac{d}{t}$$

Question 19

Which abdominal muscle is primarily responsible for compressing the abdominal contents?

Accepted Answer

Transversus abdominis

Question 20

Which of the following best describes the function of the autonomic nervous system?

Accepted Answer

Regulates involuntary functions such as heart rate and digestion

Muscle Tissue, Muscle Physiology, and Introduction to the Nervous System

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