Muscles! Word Scramble
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Question | Answer |
contractility | ability to shorten w/ force |
excitability | ability to respond to stimulus |
extensibility | ability to be stretched |
elasticity | ability to recoil after being stretched |
epimysium | connective tissue sheath that surrounds skeletal muscle |
fascia | connective tissue that is outside the epimysium that separates muscles |
what do muscles do that are essential to the body's maintenance? | produce heat |
fasciculi | numerous visible bundles of muscle |
perimysium | loose connective tissue that surrounds the fasciculi |
what are fasciculi composed of? | single muscle cells called muscle fibers |
endomysium | surrounds each muscle fiber |
myofibrils | threadlike structure that extends from one end of the fiber to the other |
actin myofilaments | thin myofilaments(looks like pearls twisted together) |
myosin myofilaments | thick myofilaments(looks like mini golf clubs) |
sarcomeres | join end to end to form myofibril |
what is on each side of the Z line? | I bands: which consists of actin |
what does the H zone consist of? | myosin ONLY |
What is the charge difference between membranes called? | resting membrane potential |
what is action potential? | the brief reversal back of the charge of stimulus |
motor neurons | nerve cells that carry action potential to skeletal muscle fibers |
neuromusclular junction | axons that branch into the muscle and connect |
motor unit | single motor neuron and all skeletal muscle innervates |
presynaptic terminal | enlarged nerve terminal |
synaptic cleft | space between the presynaptic terminal and muscle cell |
postsynaptic terminal | muscle fiber |
synaptic vesicles | they secrete neurotransmitters |
acetylcholine | neurotransmitters |
what is creatine phosphate? | a high energy molecule |
what does anaerobic respiration mean? | w/o oxygen |
aerobic respiration | with oxygen |
what is oxygen debt? | amount of oxygen needed in chemical reactions to convert lactic acid to glucose |
what is muscle fatigue? | results when ATP is used during muscle contraction faster than it can be produced |
what does isometric mean? | length of the muscle stays the same nut tension increases |
what does isotonic mean? | muscle length changes but tension stays same |
muscle tone | constant tension produced by muscles for long periods of time |
fast twitch fibers | contract quickly and fatigue quickly |
slow twitch fibers | contract more slowly and are more resistant to fatigue |
origin of the muscle | most stationary end of muscle |
insertion | part of muscle undergoing most movement |
belly of muscle | inbetween origin and insertion |
can muscles have more then one origin? | yes |
what are synergists? | muscles that work together |
what are antagonists? | muscles that work against each other |
what is a prime mover? | a muscle in a group of synergists that does the most moving |
what does the occipitofrontalis do? | moves eyebrows |
orbicularis oris? | moves mouth |
orbicularis oculi? | closes eyes |
buccinator? | flattens cheeks |
zygomaticus? | smile |
levator labii superioris? | snarling |
depressor anguli oris? | frowning |
two types of chewing muscles | masseter and temporalis |
what are intrinsic muscles? | changes the shape of the tongue |
what are extrinsic muscles? | moves tongue |
prime neck mover? | sternocleidomastoid |
what is torticollis? | wry neck |
Created by:
jess_call11
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