$$3\ \mathrm{Na}^+\ \text{out},\ 2\ \mathrm{K}^+\ \text{in}$$

Question 1

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

Accepted Answer

Generating red blood cells

Question 2

During muscle contraction, which neurotransmitter is released at the neuromuscular junction?

Accepted Answer

Acetylcholine

Question 3

If acetylcholinesterase is inhibited, what would happen to muscle contraction?

Accepted Answer

Muscle contraction would be prolonged due to continued stimulation

Question 4

Which structure in a muscle fiber stores calcium ions necessary for contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 5

A patient is unable to extend their arm. Which muscle is most likely impaired?

Accepted Answer

Triceps brachii

Question 6

Which band in the sarcomere contains only thin filaments?

Accepted Answer

I band

Question 7

What is the main action of the zygomaticus major muscle?

Accepted Answer

Causes the muscle to smile

Question 8

Which of the following best describes a first-class lever in the human body?

Accepted Answer

The fulcrum is always in the middle

Question 9

Which event occurs first in the contraction cycle of a skeletal muscle?

Accepted Answer

Calcium ions bind to troponin

Question 10

A decrease in which neurotransmitter would cause Parkinson-like symptoms?

Accepted Answer

Dopamine

Question 11

Which equation best represents the sodium-potassium exchange pump at resting membrane potential?

Accepted Answer

$$3\ \mathrm{Na}^+\ 	ext{out},\ 2\ \mathrm{K}^+\ 	ext{in}$$

Question 12

Which muscle is responsible for abduction of the shoulder?

Accepted Answer

Deltoid

Question 13

Which of the following is true about the zone of overlap in a sarcomere?

Accepted Answer

It contains both actin and myosin filaments

Question 14

Which type of muscle fiber is most resistant to fatigue and is used for endurance activities?

Accepted Answer

Slow oxidative fibers

Question 15

Which cranial nerve controls the lateral rectus muscle of the eye?

Accepted Answer

Abducens nerve (VI)

Question 16

Which of the following best describes the process of treppe in muscle tension production?

Accepted Answer

A stair-step increase in tension with repeated stimulation after relaxation

Question 17

Which structure connects the cell body of a neuron to the axon terminal?

Accepted Answer

Axon

Question 18

Which muscle passes through the zygomatic arch?

Accepted Answer

Masseter

Question 19

Which of the following is a real-life example of a second-class lever in the human body?

Accepted Answer

Standing on tiptoe

Question 20

Which protein is associated with the thin filament in skeletal muscle?

Accepted Answer

Actin

Skeletal Muscle Structure, Function, and Physiology Study Guide

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