Ch 11

Question 1

Bilateral action of erector spinae muscles

Answer 1

Maintain posture

Extend the vertebral column

Question 2

Muscles in rotator cuff

Answer 2

Supraspinatus

Teres minor

Subscapularis

Question 3

Muscles in quadriceps

Answer 3

Rectus femoris

Bastia intermedius

Vastus lateralis

Question 4

Muscles in hamstrings

Answer 4

Biceps femoris

Semimembranous

Question 5

Action of gluteus maximus

Answer 5

Extension of thigh

Question 6

Diaphragm

Answer 6

Internally placed, some-shaped muscle that forms a partition between the thoracic and abdominal cavities

Question 7

Antagonist

Answer 7

Triceps brachii is stretched as you flex your forearm at the elbow

Question 8

Agonist

Answer 8

Triceps brachii contracts to extend the forearm

Question 9

Synergist

Answer 9

Biceps brachii and brachioradialis contract to flex your forearm at the elbow

Question 10

Masseter

Answer 10

Most powerful muscle of mastication

Elevates and protracts the mandible

Question 11

Small motor units

Answer 11

Greater control

Fine motor skills

Question 12

Larger motor units

Answer 12

Less control

Question 13

Muscle fiber parts

Answer 13

Synaptic knob (end of axon)

Motor end plate

Synaptic cleft

Question 14

Acetylcholine (ACh)

Answer 14

Neurotransmitter

Sends signal to nerve

Question 15

Motor end plate

Answer 15

Specialized region of the sarcolemma of muscle fiber

Chemically gated, channels open when ACh binds

Question 16

Synaptic cleft

Answer 16

Narrow space separating the synaptic knob and motor end

Question 17

Legs muscles in anterior compartment

Answer 17

Dorsiflexors and toe extensors

Question 18

Leg muscles in lateral compartment

Answer 18

Evertors and weak plantar flexors

Question 19

Muscles in posterior compartment

Answer 19

Plantar flexors and flexors of leg and toes

Question 20

Myoglobin

Answer 20

Protein that binds oxygen when the muscle is at rest and release oxygen during contraction

Question 21

Short term supply

Answer 21

Glucose available from glycogen

50-60 sec

Question 22

Long term supply

Answer 22

Aerobic cellular respiration

5-6 min

Question 23

Fast twitch

Answer 23

Strong contraction

quick and powerful

Short duration

Question 24

Slow twitch

Answer 24

Weak contraction

Slow and weak

Long duration

Question 25

Slow oxidative

Answer 25

Slow, fatigue resistant

Maintains POSTURE

Question 26

Fast glycolytic

Answer 26

Fast twitch

Easily fatigue

Short duration

Sprinting or weightlifting