Question 1

A neuron and all the muscle fibers it stimulates is called a________ .

Accepted Answer

A)  motor unit
B)  myoneural junction
C)  synaptic cleft
D)  fascicle

Question 2

Tendons differ from ligaments in that ________.

Accepted Answer

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

Question 3

The function of the neuromuscular junction is to________ .

Accepted Answer

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

Question 4

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)  a muscle cell.

Question 5

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

Accepted Answer

A)  diffuses across the synaptic cleft, binds to receptors on the muscle membrane, and ultimately causes the muscle to depolarize and contract
B)  diffuses across the synaptic cleft
C)  ultimately causes the muscle to depolarize and contract
D)  binds to receptors on the muscle membrane

Question 6

Sarcomeres consist of _________.

Accepted Answer

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

Question 7

An aponeurosis is________ .

Accepted Answer

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

Question 8

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

Accepted Answer

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

Question 9

This contractile protein forms the thin filaments.

Accepted Answer

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

Question 10

Terminal cisterns________ .

Accepted Answer

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

Question 11

The neuromuscular junction consists of________ .

Accepted Answer

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

Question 12

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

Accepted Answer

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

Question 13

This contractile protein is shaped like a golf club.

Accepted Answer

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

Question 14

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

Accepted Answer

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

Question 15

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

Accepted Answer

A)  ligament
B)  deep fascia
C)  tendon

Question 16

The dark band of skeletal muscle results from the alignment of .

Accepted Answer

A)  thick filaments
B)  elastic filaments
C)  T tubules
D)  thin filaments

Question 17

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

Question 18

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 19

The space between the axon terminal and the sarcolemma of a muscle fiber is called the________ .

Accepted Answer

A)  synaptic cleft
B)  muscle gap
C)  aponeurosis cleft
D)  nerve gap

Question 20

The thick and thin filaments are made up of _________.

Accepted Answer

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

Exam 12: Microscopic Anatomy and Organization of Skeletal Muscle

A neuron and all the muscle fibers it stimulates is called a________ .

Correct AnswerverifiedShow Answer

Tendons differ from ligaments in that ________.

Correct AnswerverifiedShow Answer

The function of the neuromuscular junction is to________ .

Correct AnswerverifiedShow Answer

A muscle fiber is _________ .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Sarcomeres consist of _________.

Correct AnswerverifiedC

An aponeurosis is________ .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

This contractile protein forms the thin filaments.

Correct AnswerverifiedShow Answer

Terminal cisterns________ .

Correct AnswerverifiedShow Answer

The neuromuscular junction consists of________ .

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

This contractile protein is shaped like a golf club.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The dark band of skeletal muscle results from the alignment 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 AnswerverifiedC

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

Correct AnswerverifiedShow Answer

The space between the axon terminal and the sarcolemma of a muscle fiber is called the________ .

Correct AnswerverifiedShow Answer

The thick and thin filaments are made up of _________.

Correct AnswerverifiedShow Answer

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C

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A

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C

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