unit 6a: muscles

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muscle fatigue

a muscle that has loss its ability to contract due to an increase in lactic acid

muscle fiber

a single muscle cell is represented by

2 filaments

actin and myosin

actin

globular protein

aerobic

has a high ATP yield

anaerobic

has a low ATP yield

creatine phosphate

helps ATP be regenerated from ADP

filaments

inside myofibrils

oxygen debt

lactic acid accumulation results in...

sarcolemma

the cell membrane of muscle cell

fascia

the covering that separates one muscle from another

sarcoplasm

the cytoplasm of a muscle cell

tendon

the fascia that extends beyond the muscle and attaches to bone

aponeuroses

the fascia that extends beyond the muscle and attaches to the other muscle

motor end plate

the location on a muscle fiber where a junction forms

acetylcholine

the neurotransmitter that functions to stimulate the muscle fiber during contraction

hemoglobin

the oxygen carrying molecule in blood

myoglobin

the oxygen carrying molecule in muscle tissue

myosin

the protein filament that contains cross bridges

neuromuscular junction

the site where a nerve fiber and muscle fiber meet

calcium ions and acetylcholine

what chemicals are responsible for muscle contraction

actin

what filament is troponin and tropomyosin connected to?

sarcoplasmic reticulum

where calcium ions are stored prior to muscle contraction

vesicles

where is acetylcholine stored and released from?

sarcoplasmic reticulum

where is calcium stored and released from?

ATP

where the energy that is needed for muscle contraction to occur comes from


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