Friedman- 3 Muscular - Sheet1 Flashcards Preview

Anatomy > Friedman- 3 Muscular - Sheet1 > Flashcards

Flashcards in Friedman- 3 Muscular - Sheet1 Deck (30):
1

Function of muscular system

Production of movement, maintaining posture, stabilization of joints, heat generation

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type of muscle

skeletal, smooth, cardiac

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skeletal

Voluntary movement, connected to bone, multinucleated

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Smooth

no striation, involuntary movement, found in stomach-intestine-bladder-respiratory passage. movement is slow and sustained.

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Cardiac

Found only in heart, striated, involuntary movement, contain intercaleted discs

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Intercalated discs (cardiac)

Proteins that connect two muscle cells together, provide strength for repetitive motion

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Skeletal (microscopic)

striation: light/dark pattern. structures present inside the muscle cells known as srcomere

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Sarcomere

thick filament (myosin) thin filament (actin)

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skeletal (activity)

contraction requires nerve impulse

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neuromuscular junction

axon terminal connected to sarcolemma of muscle (space between nerve ending/axon terminal & muscle fiber)

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nerve impulse (skeletal muscle contraction)

Neuromuscular junction-release of neurotransmitter Ach- Na+/K+ channels open-opening of calcium channels-lead to muscle contraction

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all or none law

one muscle cell is fully contracted when stimulated

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aerobic respiration

presence of oxygen-lots of ATP (32 ATP per glucose)

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anaerobic respiration

absense of oxygen-limited ATP(2 ATP per glucose) -lactic acid

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aerobic endurance

exercise: jogging, biking, etc..

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striation

light/dark pattern

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fibril

organiuzed protein structure inside of muscle fiber

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A band

Dark portion of striation where thick and thin filaments overlap

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I band

light port of the striation where only actin is present

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M line

support beam for actin (thick filament)

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Z line

support beam for myosin (thin filament)

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neurotransmitter

chemical signal that allows one nerve to interact with another nerve/muscle fiber

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axon terminal

nerve endings/contains neurotransmitters

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Channels/openings on skeletal muscle

Na+ & K+

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Action potential

changing voltage of cell - leads to release of calcium from within cell

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Ach

neurotransmitter acetylcholine that leads to muscle contraction

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steps of contraction

Ach cause opening of Na+ & K+ channels > creates action potential > release of calcium from within cell > direct effect of sarcomere > muscle contraction

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normal activity

increase of mitochondria

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lack of activity

decrease in mitochondria

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high activity

DRASTIC increase of mitochondria