Circulatory Systems and the Cardiac Cycle-B5
- Created by: Shannon
- Created on: 29-05-13 11:07
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- Circulatory Systems and the Cardiac Cycle
- Cardiac cycle-sequence of events as blood enters and leaves the heart
- Atria muscles contract as ventricles relax to receive blood through the atrio-ventricular valves (prevent backflow of blood)
- Semi lunar valves prevent the backflow of blood
- Atria muscles contract as ventricles relax to receive blood through the atrio-ventricular valves (prevent backflow of blood)
- Double circulatory system-heart and lungs obtain oxygen; heart and the rest of the body deliver oxygen to cells
- 4 chambered heart: 2 atria receive blood, 2 ventricles distribute
- Heart rate is increased by adrenaline
- Cells called pacemakers control heart beat through an electric current
- Sino atrial node (SAN)-atria contract, stimulate AVN
- Atrio ventricular node (AVN)-electrical impulses coordinate heart muscle contraction
- Sino atrial node (SAN)-atria contract, stimulate AVN
- Cells called pacemakers control heart beat through an electric current
- Veins have valves to ensure no backward blood flow
- High pressure damages capillaries
- Echocardiodi-agram- monitor irregular heart actions
- Cardiac cycle-sequence of events as blood enters and leaves the heart
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