functions of the heart
- Created by: Chantelle..
- Created on: 19-06-18 19:53
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- functions of the heart
- heart acts as a double pump
- 1) blood enters atria
- once full it contracts
- pushes blood into ventricles
- through tricuspid & mitral valve
- pushes blood into ventricles
- once full it contracts
- 2) once ventricles have filled
- they contract from bottom upwards
- forces blood up against tricuspid & mitral valve
- closes them
- forces blood up against tricuspid & mitral valve
- they contract from bottom upwards
- blood can only leave heart through
- semilunar valves, pulmonary arteries & aorta
- once blood leaves left ventricle
- = relax & start to open again
- back flow is prevented by semi lunar valves
- by snapping shut
- cardiac cycle: coordinated blood flow through the heart
- takes place 70 times a minute
- systole: ventricles are contract
- diastole: ventricles relaxing
- left ventricle wall is thicker than right
- right side = less muscular
- prevents blood from entering lungs under pressure
- right side = less muscular
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