Muscular Chapter 8

Question 1

3 types of muscle

Answer 1

Cardiac Muscle → Contains intercalated discs
Skeletal Muscle → Attaches to bones of the body
Smooth Muscle → Located in organs such as the intestines

Question 2

Isotonic contraction

Answer 2

The muscle changes length, producing movement either by eccentric contraction (muscle lengthens) or concentric contraction (muscle shortens).

Question 3

Isometric contraction

Answer 3

The muscle pulls forcefully against a load but does not shorten.
(Example plank, wall sit)

Question 4

Twitch Contraction

Answer 4

erky and rapid uncontrolled response to a stimulus occurring in isolated muscle groups → Twitch Contraction

Question 5

Tetanic Contraction

Answer 5

A series of stimuli bombarding the muscle but playing a minimal role in muscle function in daily routine activities. → Tetanic Contraction

Question 6

Muscles around the face

Answer 6

Orbicularis Oculi → Maxilla and frontal bone,
Masseter → Mandible,
Frontal → Skin of eyebrow,
Orbicularis Oris → Encircles lips, Zygomaticus → Angle of mouth and upper lip,
Sternocleidomastoid → Mastoid process

Question 7

What is the thickest and thinnest part of the myofilament?

Answer 7

The myofilament that is thickest → Myosin,

The myofilament that is thinnest → Actin,

Question 8

What is the smallest unit of the muscle organ and the smallest unit of the muscle cell?

Answer 8

The smallest unit or a muscle cell → Sarcomere,

The smallest unit of a muscle organ → Fibre

Question 9

Movement
Abduction vs adduction

Answer 9

Abduction- moving away from midline (moving arms out to the side)

Adduction - moving towards the midline
(Arms down to side)

Question 10

Movement: describe
Rotation

Answer 10

Movement around the longitudinal axis

Question 11

Movement
Extension vs flexion

Answer 11

Extension- movement making the angle between two bones at their joint larger then it was

flexion-movement making the angle between two bones at the joint smaller then it was.

Question 12

Shaking your head “no” is what type of movement

Answer 12

Rotation

Question 13

The origin of a muscle is the

Answer 13

Attachment to the more stationary bone

Question 14

Muscle contraction
Isolated muscles plays a minimal role in normal muscle activity

Answer 14

Twitch

Question 15

Damage to a ligament results in this injury

Answer 15

Sprain

Question 16

Muscle that contains striations

Answer 16

Skeletal
Cardiac

Question 17

Triceps brachii and biceps brachii are

Answer 17

Antagonists to each other

Question 18

Muscle characteristic of cells with a tapered ends and a single nucleus

Answer 18

Smooth

Question 19

Unsuccessfully attempting to lift 500lbs is this type of muscle contraction

Answer 19

Isometric

Question 20

Muscle type specializes in contractions or shortening

Answer 20

All:
Skeletal
Cardiac
Smooth

Question 21

The insertion of a muscle is the

Answer 21

Attachment most responsible for a specific movement

Question 22

What muscle are intercalated disks found in

Answer 22

Cardiac

Question 23

Voluntary muscle is aka

Answer 23

Skeletal

Question 24

Primary functions of the muscular system

Answer 24

Movement
Producing heat
Maintaining posture

Question 25

In extending the elbow what muscle is the prime mover

Answer 25

Triceps brachii

Question 26

Move opposite to “flexion”

Answer 26

Extension

Question 27

What happens when a muscle contracts

Answer 27

Stimulus rises above the threshold stimulus
Impulse crosses the neuromuscular junction
A motor neuron stimulates a muscle cell

Question 28

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

Answer 28

Abduction

Question 29

Tonic muscle contractions help the body…

Answer 29

Maintain posture

Question 30

Smooth muscle is aka

Answer 30

Visceral muscle

Question 31

Damaged muscle rear near a tendon may result in a

Answer 31

Strain