Chapter 8 Flashcards
T/F Glycolysis yields very few ATP molecules
True
T/F Threshold is minimal stimulation needed to contract muscle
True
T/F Endomysium covers & separates every muscle fiber
True
T/F A neurotransmitter crosses the synaptic cleft b/w nerve and muscle fiber and stimulates the muscle to contract
True
T/F Motor neuron and the muscle that it controls constitute a motor unit
True
T/F During muscle contraction calcium ions interact with Troponin and Tropomyosin and expose active sites for cross bridge formation
True
Neurotransmitters are stored in vesicles within
motor neuron endings
Impulse that triggers contraction spreads out over sarcolemma then travels deep by
Transverse tubules
Sarcomere best described as
Section or unit within a myofibril
myofibrils are composed of
actin & myosin
enzyme acetylcholinesterase causes acetylcholine
decompose
Creatine phosphate serves to
supplies energy for synthesis of ATP
Thicker filaments of this cross bridge when calcium helps to expose site on this
actin & myosin
extends and adducts arm
Tere major & latissimus dorsi
amount of oxygen needed to support the conversion of lactic acid to glucose is called
Oxygen debt
abducts humorus
deltoid
cramp is a lack of
ATP
example of partial sustained contraction
muscle tone
multiunit smooth muscle is found in
iris & blood vessels
Levator Scapula
elevates the scapula
T/F Triceps brachii attach distally to Olecranon process of the ulna and proximally to the medial and lateral surface of humorus
True
Extends arm at elbow
Triceps brachii
increase of # of motor units with intensity increases
recruitment
abducts & rotates thigh
gluteus medius
discoloration & swelling w/ muscle strain is due to
A&C Fascia & fibers
extends thigh & flexes knee
hamstring group
all or none means
when muscle fiber contracts it contracts completely
moves head
SCM - sternocleidomastoid
mastication muscles are
temporalis, masseter
swimming & running develop
slow fatigue resistant muscle fibers
peristalsis
rhythmic waving contractions of smooth muscle
latent period
brief delay b/w the time of stimulation & beginning of contraction
antagonist
works against action
hypertrophy
muscles enlarge through forceful exercise
myoglobin
pigment synthesized in muscle stores oxygen & increases amount of oxygen in muscle support aerobic movement
strength of stimulation needed to activate movement
threshold
norepinephrin
transmitter that effects smooth muscle
lactic acid
produced from pyruvic acid & form lactate ion & hydorogen ion/may accumulate in muscles
synergist
contribute to an action by helping agonist
aponeurosis
broad fibrous sheets of connective tissue
