Muscle Physiology Flashcards

Front

Pump in sarcoplasmic reticulum

Back

Concentrates and holds Ca2+ because of Ca2+ pump.

Front

Myofibril

Back

Thick and thin filaments that slide together during muscle contraction, causing shortening.

Front

A Band

Back

Contains thick filaments.

Front

I Band

Back

Area with just thin filaments with no overlap.

Front

H Zone

Back

Area with just thick filaments with no overlap.

Front

Sarcomere

Back

One contractile unit from one Z disc to the next; responsible for striation.

Front

Thick filaments

Back

Myosin proteins with heads that can bend and bind to actin.

Front

Thin filaments

Back

Actin with binding sites for myosin heads.

Front

Troponin and tropomyosin

Back

Tropomyosin covers myosin binding sites; Ca2+ binds to troponin to move tropomyosin.

Front

Steps of excitation-contraction coupling

Back

ACh released, binds to receptors, Na+ enters, potential changes, Ca2+ released, binds to troponin.