Question 1

Which of the following is NOT a function of the muscular system?

Accepted Answer

Synthesis of neurotransmitters

Question 2

Which muscle tissue type is responsible for voluntary movements and is controlled by the nervous system?

Accepted Answer

Skeletal muscle

Question 3

Which property of muscle cells allows them to return to their original length after being stretched?

Accepted Answer

Elasticity

Question 4

What is the specialized plasma membrane of a muscle cell called?

Accepted Answer

Sarcolemma

Question 5

Which structure stores and releases calcium ions necessary for muscle contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 6

During the sliding-filament mechanism, which bands of the sarcomere narrow as the muscle contracts?

Accepted Answer

I band and H zone

Question 7

Which protein has an active site that binds with myosin during muscle contraction?

Accepted Answer

Actin

Question 8

What is the role of the Na+/K+ pump in muscle cells?

Accepted Answer

It maintains the concentration gradients of Na+ and K+ across the sarcolemma.

Question 9

Which of the following best describes the process of depolarization in an action potential?

Accepted Answer

Voltage-gated Na+ channels open, allowing Na+ to enter the cell.

Question 10

Which event directly triggers the release of acetylcholine into the synaptic cleft at the neuromuscular junction?

Accepted Answer

Arrival of an action potential at the axon terminal

Question 11

What is the primary function of regulatory proteins in the myofibril?

Accepted Answer

Dictate when a fiber may contract

Question 12

Which of the following best explains why skeletal muscle fibers are multinucleated?

Accepted Answer

They are formed by the fusion of many embryonic myoblasts.

Question 13

A patient is unable to move their skeletal muscles voluntarily but their heart and digestive muscles function normally. Which muscle tissue is most likely affected?

Accepted Answer

Skeletal muscle

Question 14

Which of the following is true regarding the propagation of an action potential in muscle fibers?

Accepted Answer

It is conducted throughout the entire sarcolemma.

Question 15

During muscle contraction, what is the role of calcium ions?

Accepted Answer

They bind to troponin, causing tropomyosin to move away from actin's active sites.

Question 16

Which of the following best describes the arrangement of myofilaments in a sarcomere?

Accepted Answer

Thin filaments are attached to Z discs, thick filaments are in the center.

Question 17

Which equation best represents the relationship between the electrical potential (V), current (I), and resistance (R) in the context of ion movement across the sarcolemma?

Accepted Answer

$$V = I 	imes R$$

Question 18

A toxin blocks voltage-gated Na+ channels in the sarcolemma. What is the most immediate effect on muscle contraction?

Accepted Answer

Action potentials cannot be generated, preventing muscle contraction.

Question 19

Which of the following best describes the function of the endomysium?

Accepted Answer

It surrounds individual myocytes.

Question 20

Which phase of muscle contraction is directly linked to the release of acetylcholine from the motor neuron?

Accepted Answer

Excitation phase

Muscle Tissue and Physiology: Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards