Question 1

Which connective tissue layer surrounds individual muscle fibers and plays a role in transmitting force generated by muscle contraction?

Accepted Answer

Endomysium

Question 2

A patient is unable to frown or show expressions of sadness. Which muscle is most likely impaired?

Accepted Answer

Depressor anguli oris

Question 3

Which of the following best describes the function of the transverse (T) tubules in skeletal muscle fibers?

Accepted Answer

Transmit action potentials deep into the muscle fiber

Question 4

During the sliding filament mechanism of muscle contraction, which molecule binds to troponin to initiate the exposure of active sites on actin?

Accepted Answer

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

Question 5

Which of the following is TRUE regarding the resting membrane potential of a skeletal muscle cell?

Accepted Answer

It is typically around $$-70\ \mathrm{mV}$$

Question 6

Which event directly causes depolarization of the sarcolemma during an action potential?

Accepted Answer

Opening of voltage-gated $$\mathrm{Na$$^{+}$$}$$ channels

Question 7

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

Accepted Answer

Acetylcholine

Question 8

A patient is experiencing muscle weakness due to the inability to break down acetylcholine in the synaptic cleft. Which enzyme is most likely deficient?

Accepted Answer

Acetylcholinesterase

Question 9

Which of the following is a function of the orbicularis oculi muscle?

Accepted Answer

Closes the eyelids

Question 10

Which statement best describes the difference between slow-twitch and fast-twitch muscle fibers?

Accepted Answer

Slow-twitch fibers are more resistant to fatigue and are used for endurance activities

Question 11

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

Accepted Answer

Blood cell formation

Question 12

Which of the following best explains why skeletal muscle appears striated under a microscope?

Accepted Answer

Alternating arrangement of actin and myosin filaments

Question 13

Which of the following is TRUE regarding the function of the M-line in a sarcomere?

Accepted Answer

It anchors the thick filaments

Question 14

Which process is responsible for generating ATP most rapidly during short, intense muscle activity?

Accepted Answer

Creatine phosphate system

Question 15

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

Accepted Answer

Binds calcium and moves tropomyosin away from actin

Question 16

Which type of ion channel opens in response to a change in membrane potential and is crucial for the propagation of an action potential?

Accepted Answer

Voltage-gated channel

Question 17

Which of the following is a function of the buccinator muscle?

Accepted Answer

Compresses the cheeks during chewing

Question 18

Which of the following best describes the function of peristalsis in smooth muscle?

Accepted Answer

Rhythmic contraction to propel contents through hollow organs

Question 19

Which of the following is TRUE regarding the difference between white matter and gray matter in the nervous system?

Accepted Answer

White matter is composed primarily of myelinated axons

Muscle and Nervous Tissue: Structure, Function, and Physiology – Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard