unit 6a: muscles
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