Chapter 8

Question 0

T/F Glycolysis yields very few ATP molecules

Answer 0

True

Question 1

T/F Threshold is minimal stimulation needed to contract muscle

Answer 1

True

Question 2

T/F Endomysium covers & separates every muscle fiber

Answer 2

True

Question 3

T/F A neurotransmitter crosses the synaptic cleft b/w nerve and muscle fiber and stimulates the muscle to contract

Answer 3

True

Question 4

T/F Motor neuron and the muscle that it controls constitute a motor unit

Answer 4

True

Question 5

T/F During muscle contraction calcium ions interact with Troponin and Tropomyosin and expose active sites for cross bridge formation

Answer 5

True

Question 6

Neurotransmitters are stored in vesicles within

Answer 6

motor neuron endings

Question 7

Impulse that triggers contraction spreads out over sarcolemma then travels deep by

Answer 7

Transverse tubules

Question 8

Sarcomere best described as

Answer 8

Section or unit within a myofibril

Question 9

myofibrils are composed of

Answer 9

actin & myosin

Question 10

enzyme acetylcholinesterase causes acetylcholine

Answer 10

decompose

Question 11

Creatine phosphate serves to

Answer 11

supplies energy for synthesis of ATP

Question 12

Thicker filaments of this cross bridge when calcium helps to expose site on this

Answer 12

actin & myosin

Question 13

extends and adducts arm

Answer 13

Tere major & latissimus dorsi

Question 14

amount of oxygen needed to support the conversion of lactic acid to glucose is called

Answer 14

Oxygen debt

Question 15

abducts humorus

Answer 15

deltoid

Question 16

cramp is a lack of

Answer 16

ATP

Question 17

example of partial sustained contraction

Answer 17

muscle tone

Question 18

multiunit smooth muscle is found in

Answer 18

iris & blood vessels

Question 19

Levator Scapula

Answer 19

elevates the scapula

Question 20

T/F Triceps brachii attach distally to Olecranon process of the ulna and proximally to the medial and lateral surface of humorus

Answer 20

True

Question 21

Extends arm at elbow

Answer 21

Triceps brachii

Question 22

increase of # of motor units with intensity increases

Answer 22

recruitment

Question 23

abducts & rotates thigh

Answer 23

gluteus medius

Question 24

discoloration & swelling w/ muscle strain is due to

Answer 24

A&C Fascia & fibers

Question 25

extends thigh & flexes knee

Answer 25

hamstring group

Question 26

all or none means

Answer 26

when muscle fiber contracts it contracts completely

Question 27

moves head

Answer 27

SCM - sternocleidomastoid

Question 28

mastication muscles are

Answer 28

temporalis, masseter

Question 29

swimming & running develop

Answer 29

slow fatigue resistant muscle fibers

Question 30

peristalsis

Answer 30

rhythmic waving contractions of smooth muscle

Question 31

latent period

Answer 31

brief delay b/w the time of stimulation & beginning of contraction

Question 32

antagonist

Answer 32

works against action

Question 33

hypertrophy

Answer 33

muscles enlarge through forceful exercise

Question 34

myoglobin

Answer 34

pigment synthesized in muscle stores oxygen & increases amount of oxygen in muscle support aerobic movement

Question 35

strength of stimulation needed to activate movement

Answer 35

threshold

Question 36

norepinephrin

Answer 36

transmitter that effects smooth muscle

Question 37

lactic acid

Answer 37

produced from pyruvic acid & form lactate ion & hydorogen ion/may accumulate in muscles

Question 38

synergist

Answer 38

contribute to an action by helping agonist

Question 39

aponeurosis

Answer 39

broad fibrous sheets of connective tissue