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Unicorn with ak47

Muscles

TermDefinition
1Contracttility shorten with force
2Excitability respond to stimulus
3Extensibilty `stretch
4elasticity ability to recoil
5epimysium connective tissue sheath around a muscle
6Fascia connective sheath outside the epimysium
7perimysium surrounds fasciculi
8Fibers muscle cell
9endomysium surronds muscle fibers
10myofibrils threadlike structure that extends from one end of a fiber to another
11actin myofilaments thin myofilament, resemble two twisted stands of pearls
12myosin myofilaments thick myofilament, bundles of golf clubs
13sacromere when actin and myosin filaments form highly ordered units
14resting membrane potential the charge difference across a membrane
15action potential the brief reversal back of a charge
16motor neurons nerve cells that carry action potentials to skeletal muscle fibers
17neuromusclular junction branch made up of axons that connects to the muscle
18synapse near the center of the cell
19motor unit single motor neuron and all skeletal muscle fibers it innervates
20presynaptic terminal enlarged nerve terminal
21synaptic cleft space between presynaptic terminal and the muscle
22postsynaptic terminal muscle fiber
23synaptic vesicles in the presynaptic terminal and secretes a neurotransmitter
24acetylcholine neurotransmitter secreted by synaptic vesicles
25acetylcholinesterase breaks down acetylcholine
26sliding filament mechanism sliding of actin myofilaments past myosin filaments during contraction
27muscle twitch a contraction of the entire muscle in response to a stimulus, causes action potential in one or muscle fibers
28treshold muscle fiber that wont respond until it has reached this
29all-or-none response once it has reached the threshold this will happen
30lag phase time between the application of the stimulus and the beginning of contraction
31contraction phase time of contraction
32relaxation phase time when the muscle relaxes
33tetany when muscles remain contracted without relaxation
34recruitments the increase number of motor units being activated
35ATP(adenosine triphosphate) needed for muscle contraction produced in the mitochondria shortlived and unstable
36ADP (adenosine diphosphate) more stable degenerated ATP
37Creatine Phosphate stockpiled when ATP can't be stockpiled
38Anaerobic resperation without oxygen
39Aerobic resperation with oxygen
40oxygen debt amount of oxygen needed to convert lactic acid into glucose and replenish depleted stores of creatine phosphate
41muscle fatigue happens when ATP is used during muscle contraction faster than it can be produced
42isometric equal distance
43isotonic equal tension
44muscle tone constant tension, head up or back straight
45fast twitch fibers contract quickly and tire quickly
46slow twitch fibers contract slowly and tire slowly
47origin most stationary part of a muscle (head)
48insertion end of muscle outgoing most movement
49belly portion bewteen head and insertion
50origin insertion and belly some muscles have multiple of these
51synergist muscles that work together
52antagonist muscles that work in opposition other muscles
53prime mover muscle that plays the most important movement
54Muscles are sometimes named by location, size, orientation of fibers, shape, origin, insertion and function
55Occipital frontalis raises eyebrows
56orbicularis oculi closes eyelids
57orbicularis oris puckers lips
58buccinator flattens cheeks
59zygomaticus smile
60levator labii superioris sneezing
60depressor anguli oris frowning
61sternocleidomastoid lateral neck muscle
62platysma corner of lips down
63mastication chewing
64extrensic muscle tongue moves the tongue
65intrinsic muscles tongue changes shape of tongue
66erector spinae along side the vertebral column
67throatic extrensic intercostals inspiration of fair
68throatic intrinsic intercostals forced expiration of air
69diaphragm dome shaped muscle
70muscle contraction causes what to shorten sacromeres
71H and I Band shorten during contraction
72A band doesn't change size
73Tendon muscle connected to bone
74linea alba white line of connective tissue that extends from sternum to pubis
75external obligues help to compress abdominal contents
76gluteus maximus extends hip
Created by: jhammerii
 

 



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