Modified endoplasmic reticulum in muscle that concentrates and stores Ca2+.
Intracellular second messenger that binds Ca2+.
Enzyme that phosphorylates light protein chains of myosin in smooth muscle.
Myosin Light Chain Kinase (MLCK)
An enzyme that catalyzes the hydrolysis of ATP to ADP; releases energy used in the cell.
A globular protein (G-actin) that polymerizes to form thin filaments (F-actin).
Forms thick filaments of the myofibril that convert chemical bond energy of ATP into motion.
Enzyme that dephosphorylates light protein chains of myosin in smooth muscle.
A single contraction/relaxation cycle in a muscle fiber.
A graphic representation of muscular contractions.
Creation of tension in muscle; active process that requires ATP.
Delay between the muscle action potential and beginning of muscle tension that represents the time required for Ca2+ release and binding to troponin.
Release of tension created by contraction.
The amount of time it takes to become ready for a second contraction.
Strength by which a muscle will give a complete response otherwise there is no response at all.
All or none response
Sustained muscle contraction.