Question 1

This contractile protein is shaped like a golf club.

Accepted Answer

A)   troponin
B)   myosin
C)   tropomyosin
D)   actin D

Question 2

This strong, cord-like structure attaches muscles to bones.

Accepted Answer

A)   ligament
B)   tendon
C)   deep fascia
D)   myofibril

Question 3

The I-band consists of .

Accepted Answer

A)   thin filaments
B)   H zone
C)   M line
D)   thick filaments

Question 4

From gross to microscopic, the parts of a muscle are .

Accepted Answer

A)   fiber, fascicle, muscle
B)   muscle, fiber, fascicle
C)   fascicle muscle, fiber
D)   muscle, fascicle, fiber

Question 5

A muscle fiber is _ .

Accepted Answer

A)   a rod-like structure consisting of sarcomeres placed end to end
B)   an arrangement of actin and myosin filaments deep within a muscle cell
C)   the elaborate arrangement of smooth endoplasmic reticulum inside a muscle cell
D)   a muscle cell

Question 6

Tendons differ from ligaments in that .

Accepted Answer

A)   tendons attach to bone and ligaments do not
B)   tendons bind muscle to bone and ligaments bind bone to bone
C)   they are formed from different tissue types
D)   tendons are broad and flat and ligaments are like cords

Question 7

The actual contractile units of muscles extend from Z disc to Z disc. They are _.

Accepted Answer

A)   sarcoplasmic reticulum
B)   thick filaments
C)   sarcomeres
D)   myofibrils

Question 8

At the neuromuscular junction, the electrical signal of the nerve .

Accepted Answer

A)   causes the axon terminal to release Na+ and K+
B)   stimulates formation of the neurotransmitter acetylcholine (ACh) 
C)   causes the axon terminal to release acetylcholine (ACh) 
D)   is sent directly to muscle

Question 9

What is the correct order of structures as you move from outside a muscle cell, to deep inside it?

Accepted Answer

A)   fiber, myofibril, myofilament
B)   myofibril, myofilament, fiber
C)   myofilament, myofibril, fiber
D)   myofilament, fiber, myofibril

Question 10

The thick and thin filaments are made up of _, respectively.

Accepted Answer

A)   the dark and light bands
B)   the H zone and the Z disc
C)   T tubules and terminal cisterns
D)   myosin and actin

Question 11

Sarcomeres consist of _.

Accepted Answer

A)   a network of sarcoplasmic reticulum
B)   bands of tissue wrapped around the sarcolemma
C)   orderly arrangements of actin and myosin
D)   myofibrils arranged one after the other

Question 12

Each of the elements that make up a skeletal muscle is surrounded by connective tissue. Which words below correctly pair the connective tissue layer with the corresponding muscle structure?

Accepted Answer

A)   functional group of muscles: endomysium
B)   fascicle: perimysium
C)   entire muscle: epimysium
D)   muscle fiber: deep fascia

Question 13

This indentation of the sarcolemma carries electrical signals deep into the muscle cells.

Accepted Answer

A)   T tubule
B)   terminal cisterns
C)   triad
D)   sarcoplasmic reticulum

Question 14

The function of the neuromuscular junction is to .

Accepted Answer

A)   convey a signal from the nervous system to skeletal muscle
B)   stimulate or inhibit the activity of skeletal muscles
C)   link nerve endings to muscle, to protect the nerve structurally
D)   connect sensory neurons directly to muscle A

Question 15

An aponeurosis is .

Accepted Answer

A)   similar to a tendon in function
B)   a structural part of the interior of muscle cells
C)   a covering of the myoneural region
D)   a disease of the neuromuscular junction A

Question 16

The neuromuscular junction consists of .

Accepted Answer

A)   a nerve touching a muscle
B)   a nerve coming into close proximity to a muscle fiber
C)   the end branch of a single nerve fiber touching a muscle
D)   the axon terminal coming into close proximity to a muscle fiber

Question 17

The dark band of skeletal muscle consists of .

Accepted Answer

A)   T tubules
B)   only thick filaments
C)   both thick and thin filaments
D)   only thin filaments

Question 18

This contractile protein forms the thin filaments.

Accepted Answer

A)   dystrophin
B)   myosin
C)   titin
D)   actin

Question 19

Terminal cisterns _.

Accepted Answer

A)   store acetylcholine
B)   carry the action potential deep into the muscle cell
C)   are made of smooth endoplasmic reticulum
D)   are an important link between the nervous system and the muscle cell

Question 20

Acetylcholine (ACh)  is the neurotransmitter of axon terminals at the neuromuscular junction. It .

Accepted Answer

A)   binds to receptors on the muscle membrane
B)   ultimately causes the motor neuron to depolarize
C)   diffuses into the muscle cell
D)   binds to receptors on the motor neuron

Exam 12: Microscopic Anatomy and Organization of Skeletal Muscle

This contractile protein is shaped like a golf club.

Correct AnswerverifiedD

This strong, cord-like structure attaches muscles to bones.

Correct AnswerverifiedShow Answer

The I-band consists of .

Correct AnswerverifiedShow Answer

From gross to microscopic, the parts of a muscle are .

Correct AnswerverifiedShow Answer

A muscle fiber is _ .

Correct AnswerverifiedShow Answer

Tendons differ from ligaments in that .

Correct AnswerverifiedShow Answer

The actual contractile units of muscles extend from Z disc to Z disc. They are _.

Correct AnswerverifiedShow Answer

At the neuromuscular junction, the electrical signal of the nerve .

Correct AnswerverifiedShow Answer

What is the correct order of structures as you move from outside a muscle cell, to deep inside it?

Correct AnswerverifiedShow Answer

The thick and thin filaments are made up of _, respectively.

Correct AnswerverifiedShow Answer

Sarcomeres consist of _.

Correct AnswerverifiedShow Answer

Each of the elements that make up a skeletal muscle is surrounded by connective tissue. Which words below correctly pair the connective tissue layer with the corresponding muscle structure?

Correct AnswerverifiedShow Answer

This indentation of the sarcolemma carries electrical signals deep into the muscle cells.

Correct AnswerverifiedShow Answer

The function of the neuromuscular junction is to .

Correct AnswerverifiedA

An aponeurosis is .

Correct AnswerverifiedA

The neuromuscular junction consists of .

Correct AnswerverifiedShow Answer

The dark band of skeletal muscle consists of .

Correct AnswerverifiedShow Answer

This contractile protein forms the thin filaments.

Correct AnswerverifiedShow Answer

Terminal cisterns _.

Correct AnswerverifiedShow Answer

Acetylcholine (ACh) is the neurotransmitter of axon terminals at the neuromuscular junction. It .

Correct AnswerverifiedShow Answer

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