Question 1

Which property of muscle tissue allows it to respond to a stimulus by generating an electrical signal?

Accepted Answer

Excitability

Question 2

A patient suffers from a disorder that impairs the ability of skeletal muscle to store oxygen. Which structure is most likely affected?

Accepted Answer

Myoglobin

Question 3

During muscle contraction, which of the following best describes the sliding filament model?

Accepted Answer

Actin and myosin filaments slide past each other, causing the sarcomere to shorten.

Question 4

Which equation best represents the relationship between force ($$F$$), muscle cross-sectional area ($$A$$), and muscle tension ($$T$$)?

Accepted Answer

$$F = T 	imes A$$

Question 5

A muscle fiber is unable to conduct an action potential. Which structure is most likely malfunctioning?

Accepted Answer

T tubules

Question 6

Which of the following is TRUE regarding cardiac muscle tissue?

Accepted Answer

It is striated and found only in the heart.

Question 7

A muscle is attached to bone via a tendon. This is an example of which type of attachment?

Accepted Answer

Indirect attachment

Question 8

Which layer surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 9

In a muscle cell, which structure stores calcium ions necessary for contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 10

Which of the following best describes the function of the longitudinal and circular layers in smooth muscle?

Accepted Answer

They facilitate peristalsis in hollow organs.

Question 11

A muscle fiber is observed to have multiple nuclei, striations, and is under voluntary control. Which type of muscle tissue is this?

Accepted Answer

Skeletal muscle

Question 12

Which protein blocks the binding sites on actin in a relaxed muscle?

Accepted Answer

Tropomyosin

Question 13

During excitation-contraction coupling, which sequence is correct?

Accepted Answer

Action potential travels along sarcolemma → T tubules → calcium released from sarcoplasmic reticulum

Question 14

Which of the following structures is responsible for the striated appearance of skeletal muscle?

Accepted Answer

Myofibrils

Question 15

If a muscle fiber's sarcomeres are damaged, which function is most directly impaired?

Accepted Answer

Contractility

Question 16

Which equation best describes the relationship between muscle heat production ($$Q$$), work done ($$W$$), and efficiency ($$\eta$$)?

Accepted Answer

$$Q = W \left( 1 - \eta \right)$$

Question 17

A muscle cell is unable to maintain its shape after stretching. Which property is most likely compromised?

Accepted Answer

Elasticity

Question 18

Which structure is found at the center of the H zone in a sarcomere?

Accepted Answer

M line

Question 19

A patient has impaired peristalsis in the intestines. Which muscle tissue is most likely affected?

Accepted Answer

Smooth muscle

Question 20

Which of the following is a function shared by all three types of muscle tissue?

Accepted Answer

Producing movement

Muscles and Muscle Tissue: Structure, Function, and Types

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