Physiology Muscle Quiz

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22 Terms

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acetylcholine (ACh)

a neurotransmitter substance stored in synaptic vesicles; binds to a specific receptor protein on the sarcolemma; made from acetic acid and choline

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acetylcholineesterase (AChase)

an enzyme used to decompose the neurotransmitter acetylcholine

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sodium

Na+

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synaptic cleft

the space found between 2 neurons or a neuron and a muscle fiber (where Acetylcholine uses Achase to break apart into choline and acetic acid)

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synaptic vesicle

a sac like organelle that stores neurotransmitter substances like ACh

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sarcolema

the technical name for the cell membrane of a muscle cell/fiber

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depolarization

the inside of the cell becomes positively charged for a brief period of time

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cardiac muscle

found in heart, involuntary contraction, single nuclei, intercalated disks, circulate blood

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smooth muscle

found in blood vessels, spindle shaped, single nuclei, involuntary contraction, no striations

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skeletal muscle

attached to bone, body movement, voluntary control, striated, multinucleate

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reasons for muscle fatigue

lack of oxygen, lactic acid build up, glycogen

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Graves disease

immune system disease that affects thyroid gland; anti-bodies attack nerve endings destroying connection between nerve and muscle causing loss of motor function

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NMJ Step 1

acetylcholine spills into synaptic cleft

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NMJ Step 2

ACh attatches to receptor site causing channels to open and sodium ions to pass through

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NMJ Step 3

ACh uses AChase to break apart into acetic acid and choline. Choline is recycled and acetic acid leaves body as waste

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NMJ Step 4

Choline passes from synaptic cleft to presynaptic terminal

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NMJ Step 5

Choline reattaches to new acetic acid molecules creating acetylcholine and forming a new synaptic vesicle.

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epimysium

connective tissue surrounding muscle

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fascicle

bundles of muscle cells/fibers

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perimysium

connective tissue surrounding fascicles

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sarcoplasmic reticulum

special endoplasmic reticulum made of interconnecting tubules surrounding each myofibril

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myofibril

small tube like structure within a muscle fiber