Chapter 9 Test

Question 1

Another name for voluntary muscle is

Answer 1

both striated and skeletal

Question 2

Intercalated disks are found in

Answer 2

Cardiac muscle

Question 3

This type of muscle tissue contains striations

Answer 3

Voluntary and cardiac

Question 4

Another name for visceral muscle is

Answer 4

Smooth muscle

Question 5

In the flexing of the elbow

Answer 5

The biceps brachia is the prime mover

Question 6

In extending the elbow

Answer 6

The triceps brachii is the prime mover

Question 7

The triceps brachii and the biceps brachii

Answer 7

Are antagonists to each other

Question 8

The movement that is opposite of flexion is

Answer 8

Extensions

Question 9

Which of the following muscles is described as striated and involuntary?

Answer 9

Cardiac

Question 10

Actin is

Answer 10

a contractile protein that is called a thin filament

Question 11

Which of the following forms cross bridges with actin

Answer 11

Myosin

Question 12

Which muscles are located between the ribs and help the rib cage during breathing

Answer 12

intercostal muscle

Question 13

What is the name of the cord of connective tissue that connects muscle to bone?

Answer 13

Tendon

Question 14

Which of the following is a series of contractile units that make up each myofibril; each unit extend from Z line to Z line?

Answer 14

Sarcomere

Question 15

This structure is an extension of the sarcolemma or cell membrane; it penetrates the interior of the muscle and carries the electrical signal to the deepest part of the muscle

Answer 15

T tubule

Question 16

The sarcoplasmic reticulum

Answer 16

Envelopes the sarcomere containing myofibrils

Question 17

What is the site of calcium storage in a relaxed skeletal muscle?

Answer 17

Sarcoplasmic reticulum

Question 18

Acetylcholine is released in response to the

Answer 18

Nerve impulse

Question 19

Which of the following is responsible for muscle relaxation

Answer 19

Calcium is pumped back into the sarcoplasmic reticulum

Question 20

The rectus, transverses, internal oblique, and the external oblique refer to

Answer 20

Abdominal muscles

Question 21

With regards to skeletal muscle contraction, which event comes first

Answer 21

Release of neurotransmitter from the somatic motor neuron

Question 22

T/f: Both smooth muscles and cardiac muscles have striations

Answer 22

False

Question 23

T/f: Both cardiac muscles and skeletal muscles have interrelated disks

Answer 23

False

Question 24

T/f: Unlike skeletal muscles, smooth muscle cells have only one nucleus

Answer 24

True

Question 25

T/f: Skeletal muscles are also called striated or visceral muscles

Answer 25

False

Question 26

T/f: Tendons attach bone to bone

Answer 26

False

Question 27

T/f: Tendons attach muscle to bone at both the origin and insertion sites

Answer 27

True

Question 28

T/f: The thick myofilaments in a skeletal muscle are composed of actin

Answer 28

False

Question 29

T/f: The thin myofilaments in a skeletal muscle are composed of actin

Answer 29

True

Question 30

T/f: Another name for a muscle cell is a muscle fiber

Answer 30

True

Question 31

T/f: The model that is used to explain how a muscle contracts is called the sliding filament model

Answer 31

True

Question 32

T/f: Sarcomeres are separated from each other by dark bands called myofilaments

Answer 32

False

Question 33

T/f: During a muscle contraction, the Z lines of that muscle come closer together

Answer 33

True

Question 34

T/f: Both calcium and ATP are needed for a muscle to contract

Answer 34

True

Question 35

T/f: When the elbow is straightened, the triceps brachii becomes the antagonistic muscle

Answer 35

False

Question 36

T/f: A muscle can be a prime mover or an antagonist depending on the movement of the joint

Answer 36

True

Question 37

T/f: Muscle tone maintains posture

Answer 37

True

Question 38

T/f: All the motor neurons that stimulate a single muscle are referred to as a motor unit

Answer 38

False

Question 39

T/f: Chemicals are released at the neuromuscular junction that stimulate the muscle to contrat

Answer 39

True

Question 40

T/f: If a prime mover causes extension, the antagonist would cause flexion

Answer 40

True

Question 41

This protein makes up the thick myofilament

Answer 41

Myosin

Question 42

This is another name for smooth muscle

Answer 42

Visceral muscle

Question 43

These structures are only found in cardiac muscles

Answer 43

Intercalated disks

Question 44

These structures separate one sarcomere from another

Answer 44

Z line

Question 45

This protein makes up the thin myofilament

Answer 45

Actin

Question 46

This is usually the non moving attachment point of a muscle

Answer 46

Origin

Question 47

This is another term for skeletal muscle

Answer 47

Voluntary muscle

Question 48

This is usually the moving attachment point of a muscle

Answer 48

Insertion

Question 49

This is the functional unit of contraction of a skeletal muscle

Answer 49

Sarcomere

Question 50

Explain the microscopic structure of the skeletal muscle

Answer 50

The skeletal muscle contains sarcomeres that contain myosin and actin that contract when the muscle moves.

Question 51

Explain the roles of the prime mover, the synergist and the antagonist in muscle contraction

Answer 51

Prime mover- muscle that does majority of the work
Anatagonist- does opposite of prime mover
Synergist- help the prime mover