Question 1

Which connective tissue layer directly surrounds individual skeletal muscle fibers?

Accepted Answer

Endomysium

Question 2

At the neuromuscular junction, which neurotransmitter is released to initiate muscle contraction?

Accepted Answer

Acetylcholine

Question 3

Which structure is responsible for transmitting the force generated by muscle fibers to bones?

Accepted Answer

Tendon

Question 4

In the sliding-filament theory, which two proteins interact to produce muscle contraction?

Accepted Answer

Actin and myosin

Question 5

Which muscle is primarily responsible for abduction of the arm at the shoulder?

Accepted Answer

Deltoid

Question 6

A motor unit consists of:

Accepted Answer

All the muscle fibers innervated by a single motor neuron

Question 7

Which muscle is the primary antagonist during elbow flexion?

Accepted Answer

Triceps brachii

Question 8

Which arrangement of muscle fibers allows for the greatest range of motion but the least force?

Accepted Answer

Strap

Question 9

If a lever system in the body has a load of 20 N and the load arm is 0.5 m, while the effort arm is 1.0 m, what is the minimum effort required to lift the load? Use the formula $ 	ext{Effort} 	imes 	ext{Effort Arm} = 	ext{Load} 	imes 	ext{Load Arm} $.

Accepted Answer

$ 10 	ext{ N} $

Question 10

Which muscle is responsible for plantar flexion of the foot?

Accepted Answer

Gastrocnemius

Question 11

Which structure in cardiac muscle allows for rapid communication and synchronized contraction?

Accepted Answer

Intercalated discs

Question 12

Which muscle is the primary flexor of the hip?

Accepted Answer

Sartorius

Question 13

Which term describes a muscle that assists the prime mover in performing an action?

Accepted Answer

Synergist

Question 14

Which muscle is responsible for extension of the knee?

Accepted Answer

Rectus femoris

Question 15

Which muscle is primarily responsible for adduction of the thigh?

Accepted Answer

Adductor longus

Question 16

Which muscle arrangement is best suited for generating high force but limited range of motion?

Accepted Answer

Multipennate

Question 17

Which muscle is the primary flexor of the elbow?

Accepted Answer

Brachialis

Question 18

Which muscle is responsible for extension of the digits?

Accepted Answer

Extensor digitorum

Question 19

Which of the following best describes the origin of a muscle?

Accepted Answer

The attachment site that remains relatively stationary during contraction

Question 20

A patient presents with difficulty extending their wrist. Which muscle is most likely affected?

Accepted Answer

Extensor carpi ulnaris

Muscle Tissue and Muscular System: Study Guide

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