- Atrial systole: SAN contracts, electrical impulses through atria, pumps blood into ventricles.
- ventricular systole: electrical impulses pass from AVN to to purkinje fibres, delay, pass through bundle of his, fibres spread out, ventricles contract.
- diastole: atria and ventricles relax, atria fill with blood,semilunar valves close.
Systole = contract.
diastole = relax.
cardiac muscle is myogenic = contracts on its own.
contractions are initiated by the sino atrial node, in the right atrium.
PCG = recording of sounds.
ECG = recording electrical activity.
caridac output increases so that oxygen and glucose get to muscles faster, carbon dioxide ,lactate and heat are carried away faster.