The swinging cross bridge theory for muscle contraction envisages that the myosin ... landmark structure — the crystal structure of the smooth muscle myosin motor-domain with the essential ...

Calcium and ATP are cofactors (nonprotein components of enzymes) required for the contraction of muscle cells. ATP supplies the energy, as described above, but what does calcium do? Calcium is ...

Heart Rate Increase in rate of contraction of cardiac muscle - cardiac output increases Decrease in rate of contraction of cardiac muscle - cardiac output decreases Breathing Rate Smooth muscle of ...