muscles Flashcards
antagonistic pairs
flexors vs extensors
- Biceps (flex) Triceps (extensor)
- Hamstrings and quadriceps
tendons
connect bone to muscle
ligaments
bone to bone
sarcolemma
muscle cell membrane
sarcoplasm
cytoplasm
microfibril
actin filaments and myosin filaments
-thin and thick
tropomyosin
strand around actin
troponin
keeps tropomyosin in place (over the actin binding sites)
ATP effect on myosin
keeps it from contracting and bonding to the actin
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Sarcoplasmic reticulum
muscle cell specialized endoplasmic reticulum
stores CA2+
–contains a lot of mitochondria
building endurance
the body makes more mitochondria for you
muscle action
nerve impulse causes release of acetylcholine
- taken by receptor proteins
- makes a nerve signal goes dow t tubules
- makes CA2+ release
ratchet system
fiber filament model
-the fibers move back and forth
acetylcholinesterase
breaks down acetylcholine to prevent nerve impulse from stimulating muscle fiber
- Ca2+ moves callus back to SR and
- muscle stops contracting
slow twitch
-contract slowly and keep going for long times
-dark meat (migratory birds) ===more blood vessels
-long distance runner
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