muscle test

Question 1

Muscle tissue, one of the four basic tissue groups, consists chiefly of cells that are highly specialized for

Answer 1

contraction

Question 2

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

Answer 2

A) produce movement
B) maintain posture
C) maintain body temperature
D) guard body entrances and exits

Question 3

At each end of the muscle, the collagen fibers of the epimysium, and each perimysium and endomysium, come together to form a

Answer 3

tendon

Question 4

The dense layer of connective tissue that surrounds an entire skeletal muscle is the

Answer 4

epimysium

Question 5

Nerves and blood vessels that service a muscle fiber are located in the connective tissues of its

Answer 5

endomysium

Question 6

A fascicle is

Answer 6

a group of muscle fibers that are encased in the perimysium.

Question 7

Put the following structures in order from superficial to deep:

Answer 7

epimysium, perimysium, fascicle, endomysium, muscle fiber and myofibril

Question 8

Interactions between actin and myosin filaments of the sarcomere are responsible for

Answer 8

muscle contraction

Question 9

In a sarcomere, thick filaments are linked laterally by proteins of the

Answer 9

M line.

Question 10

The advantage of having many nuclei in a skeletal muscle fiber is

Answer 10

the ability to produce large amounts of the muscle proteins needed for growth and repair.

Question 11

Skeletal muscle fibers are formed from embryonic cells called

Answer 11

myoblasts

Question 12

The repeating unit of a skeletal muscle fiber is the

Answer 12

sarcomere

Question 13

The plasma membrane of a skeletal muscle fiber is called the

Answer 13

sarcolemma.

Question 14

Which of the following best describes the term sarcomere?

Answer 14

repeating unit of striated myofibrils

Question 15

Muscle fibers differ from “typical cells” in that muscle fibers

Answer 15

have many nuclei.

Question 16

Which of the following best describes the term sarcoplasmic reticulum?

Answer 16

storage and release site for calcium ions

Question 17

Which of the following best describes the term Z line?

Answer 17

largely made of myosin molecules

Question 18

The region of the sarcomere containing the thick filaments is the

Answer 18

A band.

Question 19

Each thin filament consists of

Answer 19

two actin protein strands coiled helically around each other.

Question 20

At rest, active sites on the actin are blocked by

Answer 20

tropomyosin molecules.

Question 21

Which statement about the microscopic anatomy of skeletal muscle fibers is true?

Answer 21

A) Tubular extensions of the sarcolemma penetrate the fiber transversely.
B) Cross striations result from the lateral alignment of thick and thin filaments.
C) Each fiber has many nuclei.
D) Muscle fibers are continuous from tendon to tendon.

Question 22

When a skeletal muscle fiber contracts,

Answer 22

A) the H bands and I bands get smaller.
B) the zones of overlap get larger.
C) the Z lines get closer together.
D) the width of the A band remains constant.

Question 23

Each skeletal muscle fiber is controlled by a motor neuron at a single

Answer 23

neuromuscular junction.

Question 24

After death, muscle fibers run out of ATP and calcium begins to leak from the sarcoplasmic reticulum into the sarcoplasm. This results in a condition known as

Answer 24

rigor mortis.

Question 25

Triggering of the muscle action potential occurs after

Answer 25

acetylcholine binds to chemically-gated channels in the end plate membrane.

Question 26

In a______ muscle, the fascicles are concentrically arranged around an opening.

Answer 26

circular

Question 27

The type of muscle whose functional characteristics most closely resemble those of its muscle fibers is the _______muscle.

Answer 27

parallel

Question 28

Muscles with fibers that run parallel to the long axis of the body are called

Answer 28

rectus.

Question 29

Skeletal muscles in which the fascicles form a common angle with the tendon are muscles.

Answer 29

convergent

Question 30

Which of the following is not one of the forms of fascicle organization?

Answer 30

perpendicular

Question 31

____muscle fibers pull in different directions, permitting different actions depending on stimulation.

Answer 31

Convergent

Question 32

Most of the skeletal muscles in the body are

Answer 32

parallel muscles.

Question 33

A lever consists of

Answer 33

a rigid structure and a fulcrum.

Question 34

The most common lever systems in the body are those that have the applied force between the fulcrum and the load. These are called_____

Answer 34

third-class

Question 35

Contracting the gastrocnemius muscles to elevate the body on the toes involves a______ lever.

Answer 35

second-class

Question 36

Muscular walls of the thorax and abdomen are composed of

Answer 36

oblique and rectus muscles.

Question 37

A muscle that flexes the spinal column is the

Answer 37

rectus abdominis.

Question 38

Damage to which of the following muscles would interfere most with the ability to breathe?

Answer 38

intercostals

Question 39

Excessive abdominopelvic pressure can cause

Answer 39

an inguinal and a diaphragmatic hernia.

Question 40

Pam's daughter is born cross-eyed. As she grows, the problem does not become any better. Her physician suggests cutting an eye muscle to bring the eyes into a more normal position. Which muscle will he cut?

Answer 40

medial rectus

Question 41

Tom, a trumpet player, asks you which muscles he should develop in order to be a better trumpeter. What would you tell him?

Answer 41

the buccinator and orbicularis oris

Question 42

Damage to the pectoralis major would interfere with a person's ability to

Answer 42

adduct the humerus.

Question 43

The pectoralis major muscle inserts on the greater tubercle of the humerus. When it con-tracts, it produces

Answer 43

flexion, medial rotation, and adduction.

Question 44

Which of the following muscles does not have an action that is antagonistic to the action of the brachialis muscle?

Answer 44

brachioradialis

Question 45

Which of the following is the insertion of the pectoralis major?

Answer 45

the greater tubercle of the humerus

Question 46

Which of the following does not move the shoulder girdle?

Answer 46

deltoid

Question 47

Muscles visible at the body surface are often called

Answer 47

superficials

Question 48

Each of the following terms is used to describe the shape of a muscle, except:

Answer 48

pectinate

Question 49

Muscles located close to the midline of the body may be called

Answer 49

medial