final; ch. 11 steps of excitation-contraction coupling

wave of electrical signals spreads out across the sacrolemma from the neurotransmitter junction, and enters the T tubles

1

electrical signals in the T tubles, open voltage gated Ca++ channels in the sacroplasmic reticulum such that Ca++ diffuses from the sacroplasmic reticulum into the cystol.

2

calcium binds to troponin of the thin filaments

3

the troponin-tropomyosin complex changes shape and exposes the active sites on the actin filaments, making them available to bind to myosin heads

4