Question 1

Which muscle type is characterized by being striated, having multiple nuclei per cell, and is under voluntary control?

Accepted Answer

Skeletal muscle

Question 2

During the sliding-filament model of skeletal muscle contraction, which two proteins interact to produce movement?

Accepted Answer

Actin and myosin

Question 3

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

Accepted Answer

Acetylcholine

Question 4

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

Accepted Answer

Production of hormones

Question 5

A motor unit consists of:

Accepted Answer

A motor neuron and all the muscle fibers it innervates

Question 6

Which muscle type is involuntary, striated, and typically has one or two nuclei per cell?

Accepted Answer

Cardiac muscle

Question 7

Which movement describes increasing the angle between two bones at a joint?

Accepted Answer

Extension

Question 8

Which of the following best describes the process of muscle contraction according to the sliding-filament theory?

Accepted Answer

Myosin heads bind to actin, pulling the actin filaments toward the center of the sarcomere

Question 9

Which of the following is a special function of skeletal muscle?

Accepted Answer

Protection of internal organs

Question 10

Which step in the generation of an action potential involves the rapid influx of sodium ions ($$\mathrm{Na^+}) $$into the muscle cell?

Accepted Answer

Depolarization

Question 11

A patient is unable to perform plantar flexion. Which muscle group is most likely affected?

Accepted Answer

Gastrocnemius and soleus

Question 12

Which movement describes turning the palm upward?

Accepted Answer

Supination

Question 13

Which of the following best describes the location of smooth muscle?

Accepted Answer

Walls of hollow organs

Question 14

Which of the following is the correct sequence of events for the six steps of nerve stimulation and action potential in skeletal muscle?

Accepted Answer

Neurotransmitter release, binding to receptor, sodium influx, depolarization, potassium efflux, repolarization

Question 15

Which movement describes moving a limb away from the midline of the body?

Accepted Answer

Abduction

Question 16

Which muscle type is non-striated, has a single nucleus per cell, and is involuntary?

Accepted Answer

Smooth muscle

Question 17

Which of the following movements is unique to the thumb and allows humans to grasp objects?

Accepted Answer

Opposition

Question 18

If a person is unable to extend their knee, which muscle group is most likely impaired?

Accepted Answer

Quadriceps femoris

Question 19

Which of the following is a property of cardiac muscle that distinguishes it from skeletal muscle?

Accepted Answer

It has intercalated discs

Question 20

Which equation best represents the relationship between force ($$F$$), mass ($$m$$), and acceleration ($$a) in $$the context of muscle contraction?

Accepted Answer

$$F = m 	imes a$$

Muscle Tissue Characteristics and Skeletal Muscle Physiology Study Guide

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