Deck 8: Muscular System

Question 1

Tonic contractions

A) move a muscle through a full range of motion
B) do not shorten the muscle
C) are important in maintaining posture
D) both b and c above

Answer 1

D

Question 2

When a muscle fiber is subjected to a stimulus,it contracts completely.This is called

A) threshold stimulus
B) the all-or-none-law
C) twitch contraction
D) tetanic contraction

Answer 2

B

Question 3

A fluid-filled sac that acts as a lubricating structure for muscle movement is a(n)

A) origin
B) insertion
C) tendon
D) bursae

Answer 3

D

Question 4

The point of contact between the nerve and the muscle fibers it stimulates is called a

A) motor unit
B) neuromuscular junction
C) motor neuron
D) neurotransmitter

Question 5

The thin myofilament of the skeletal muscles is made of

A) sarcomere
B) actin
C) myosin
D) Z lines

Question 6

The connective tissue that attaches muscle to bone is called

A) origin
B) insertion
C) tendon
D) bursae

Question 7

The muscle attachment to the more movable bone is called the

A) origin
B) insertion
C) tendon
D) bursae

Question 8

Another name for skeletal muscle is

A) cardiac muscle
B) visceral muscle
C) voluntary muscle
D) involuntary muscle

Question 9

The thick myofilament of the skeletal muscles is made of

A) sarcomere
B) actin
C) myosin
D) Z lines

Question 10

If an injury caused damage to the insertion of the biceps brachii muscle (the anterior muscle of the upper arm),the injury would be nearest

A) the shoulder
B) the middle of the upper arm
C) the elbow
D) none of the above

Question 11

The basic contractile unit of a skeletal muscle is the

A) sarcomere
B) actin
C) myosin
D) Z lines

Question 12

Striations are found in

A) smooth muscle
B) skeletal muscle
C) cardiac muscle
D) both b and c

Question 13

Intercalated disks are found in

A) smooth muscle
B) skeletal muscle
C) cardiac muscle
D) voluntary muscle

Question 14

Another name for smooth muscle is

A) cardiac muscle
B) visceral muscle
C) voluntary muscle
D) skeletal muscle

Question 15

To produce smooth movement at a joint

A) the prime mover and antagonists must contract
B) the antagonist and synergists must contract
C) the prime mover and synergists must contract
D) both a and b above

Question 16

The muscle attachment to the more stationary bone is called the

A) origin
B) insertion
C) tendon
D) bursae

Question 17

According to the sliding filament model,in order for a sarcomere to contract

A) bridges must form between the actin and myosin
B) calcium must be released from the endoplasmic reticulum
C) adenosine triphosphate (ATP) must be broken down for energy
D) all of the above

Question 18

A single motor neuron with all the muscle cells it innervates is called a

A) motor unit
B) neuromuscular junction
C) neurotransmitter
D) both b and c above

Question 19

When a muscle contraction occurs

A) the actin gets shorter
B) the myosin gets shorter
C) the Z lines are pulled closer together
D) both a and b

Question 20

The minimal level of stimulation required to cause a fiber to contract is called

A) a threshold stimulus
B) the all-or-none law
C) twitch contraction
D) tetanic contraction

Question 21

Which of the following muscles is not a muscle of the head and neck?

A) Frontal
B) Masseter
C) Latissimus dorsi
D) Zygomaticus

Question 22

Which of the following muscles is not a muscle that moves the upper extremities?

A) Biceps brachii
B) Triceps brachii
C) Latissimus dorsi
D) Rectus abdominis

Question 23

The opposite movement of rotation is

A) flexion
B) abduction
C) pronation
D) none of the above

Question 24

What allows you to lift different weights with the same muscle is the

A) difference in the threshold stimulus
B) number of motor units used by the muscle
C) all-or-none law
D) isometric contraction of the muscle fibers

Question 25

The muscle contracts but does not shorten,even though an increase in muscle tension does occur.This sentence describes

A) twitch contractions
B) tetanic contractions
C) isotonic contractions
D) isometric contractions

Question 26

A bursae is a saclike structure that is filled with

A) blood
B) synovial fluid
C) blood plasma
D) lymph

Question 27

The term that refers to ankle and foot movement is

A) supination
B) pronation
C) dorsiflexion
D) both a and b above

Question 28

What part of the body does the pectoralis major move?

A) Head and neck
B) Upper extremities
C) Trunk of the body
D) Lower extremities

Question 29

Moving a part of the body toward the midline of the body is called

A) adduction
B) abduction
C) rotation
D) pronation

Question 30

Which of the following muscles is not a muscle that moves the lower extremities?

A) Sartorius
B) Trapezius
C) Iliopsoas
D) Gracilis

Question 31

The muscle contracts and shortens and the insertion end moves toward the point of origin.This sentence describes

A) twitch contractions
B) tetanic contractions
C) isotonic contractions
D) isometric contractions

Question 32

The movement that is opposite dorsiflexion is

A) supination
B) pronation
C) rotation
D) plantar flexion

Question 33

Movement around a longitudinal axis is

A) supination
B) rotation
C) dorsiflexion
D) pronation

Question 34

The hand position when the body is in anatomical position is

A) dorsiflexion
B) pronation
C) supination
D) plantar flexion

Question 35

If a prime mover flexes a joint

A) the synergist will extend the joint
B) the synergist and antagonist will extend the joint
C) the antagonist will extend the joint
D) the antagonist will assist in flexing the joint

Question 36

Endurance training leads to

A) an increased number of myofilaments
B) an increased number of muscle fibers
C) an increased number of blood vessels to the muscle
D) muscle atrophy

Question 37

Moving a part of the body away from the midline of the body is called

A) adduction
B) abduction
C) rotation
D) pronation

Question 38

Which of the following muscles is not a muscle of the trunk?

A) Rectus abdominis
B) Iliopsoas
C) Internal oblique
D) External oblique

Question 39

What part of the body does the external oblique move?

A) Head and neck
B) Upper extremities
C) Trunk of the body
D) Lower extremities

Question 40

Strength training leads to

A) an increased number of myofilaments
B) an increased number of muscle fibers
C) muscle atrophy
D) both a and b above

Question 41

Tension during muscle lengthening is often called

A) isotonic contractions
B) isometric contractions
C) eccentric contractions
D) antagonist contractions

Question 42

What part of the body does the masseter move?

A) Head and neck
B) Upper extremities
C) Trunk of the body
D) Lower extremities

Question 43

Cardiac muscle is found in the heart.

Question 44

What part of the body does the biceps femoris move?

A) Head and neck
B) Upper extremities
C) Trunk of the body
D) Lower extremities

Question 45

What part of the body does the rectus abdominis move?

A) Head and neck
B) Upper extremities
C) Trunk of the body
D) Lower extremities

Question 46

What part of the body does the zygomaticus move?

A) Head and neck
B) Upper extremities
C) Trunk of the body
D) Lower extremities

Question 47

What part of the body does the sternocleidomastoid move?

A) Head and neck
B) Upper extremities
C) Trunk of the body
D) Lower extremities

Question 48

Groups of muscle fibers are called

A) microfilaments
B) fascia
C) fascicles
D) none of the above

Question 49

When calcium is released into the sarcomere

A) it attaches to the myosin heads
B) acts as a crossbridge between actin and myosin
C) stimulates an ATP molecule to release energy
D) removes the blocking protein from the actin

Question 50

The loose connective tissue outside the muscle organs that forms a flexible,sticky "packing material" between the muscles,bone,and skin is called

A) microfilaments
B) fascia
C) fascicles
D) tendons

Question 51

Like skeletal muscles,cardiac muscles have striations.

Question 52

Like skeletal muscles,cardiac muscles have intercalated disks.

Question 53

What part of the body does the gastrocnemius move?

A) Head and neck
B) Upper extremities
C) Trunk of the body
D) Lower extremities

Question 54

What part of the body does the sartorius move?

A) Head and neck
B) Upper extremities
C) Trunk of the body
D) Lower extremities

Question 55

If you weigh 120 pounds,your skeletal muscles weigh about

A) 50 pounds
B) 60 pounds
C) 70 pounds
D) 40 pounds

Question 56

This is a quick,jerky response to a stimulus seen in isolated muscles but is not important in normal muscle activity

A) twitch contraction
B) tetanic contraction
C) isometric contraction
D) isotonic contraction

Question 57

Skeletal muscle is also called striated muscle.

Question 58

What part of the body does the deltoid move?

A) Head and neck
B) Upper extremities
C) Trunk of the body
D) Lower extremities

Question 59

Which of the following systems do not play a role in body movement?

A) Nervous system
B) Respiratory system
C) Circulatory system
D) All of the above systems play a role in body movements

Question 60

Smooth muscle is also called voluntary muscle.

Question 61

In order for the necessary bridges to form,potassium must be released from the endoplasmic reticulum.

Question 62

The insertion of a muscle is on the more stationary bone.

Question 63

In the sliding filament model of muscle contraction,bridges are formed between the myosin and actin.

Question 64

Z lines mark the ends of individual sarcomeres.

Question 65

In order for movement to take place,when the prime mover contracts,the synergist must relax.

Question 66

Involuntary muscles are also called visceral muscles.

Question 67

The origin of a muscle is on the more stationary bone.

Question 68

Bursae are small,fluid-filled sacs that lie between some tendons and bones.

Question 69

Tendons anchor muscles to bones.

Question 70

The origin of a muscle is on the more movable bone.

Question 71

Tonic contractions provide rapid movement for skeletal muscles.

Question 72

The breakdown of ATP is the energy source that helps supply heat to the body.

Question 73

The production of heat is a function of the muscular system.

Question 74

Energy for muscle contraction is provided when ATP is broken down.

Question 75

Hypothermia refers to a dangerous elevation in body temperature.

Question 76

The basic contractile unit of a muscle is called a sarcomere.

Question 77

In order for movement to take place,the antagonists must do the opposite of the prime mover.

Question 78

Good posture can be defined as holding the body parts in the position that favors best function.

Question 79

The thin myofilament in a muscle fiber is made of actin.

Question 80

The thick myofilament in a muscle fiber is made of actin.