Biology
- Created by: Jon_Higgs
- Created on: 23-03-14 21:04
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- Cardiac cycle
- Cycle of blood
- 1.)Deoxygenated blood enters the heart via the vena cava and enters the right atrium
- 2.Right atrium contacts, pushing open the atrioventricular valve and pushing blood into the right ventricle
- 3.)The ventricles contract, pushing the Semi Lunar valves open and into the pulmonary artery
- 4.)Heart goes through the lungs and becomes oxygenated
- 5.)Blood enters the left ventricle via the pulmonary vein
- 6.)The atria contracts pushing blood into the right ventricle
- 7.)Right Ventricle contracts and pushes blood around the body
- Nerves and nodes
- 1.) A wave of electrical energy spreads out across the SAN
- 2.)The electrical energy spreads to the atroventricular node
- The spreading of the wave causes both atria to contract
- 3.)The AVN releases another electrical wave to the Bundle of HIs
- The pause is to allow the atrioventricular valve time to close and for all the blood to pass between atria and ventricle
- 4.)The bundle of his conveys energy to muscles at the base of the heart causing them to contratc
- Cycle of blood
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