CV system AS level
- Created by: Benbingham
- Created on: 19-01-20 18:24
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- CV system
- Heart
- Conduction system
- Electrical impulses through the heart
- Order of impulse: 1.SA node 2.AV node 3.Bundle of his 4. Purkinjie fibres
- Electrical impulses through the heart
- Values
- Sub-max: Q=10L/min SV=67ml HR=150bpm
- Rest: Q=5L/min SV=70ml HR=70bpm
- Max: Q=30L/min SV=150ml HR=200bpm
- Q=cardiac output SV=stroke volume HR=heart rate
- Cardiac cycle
- Diastole
- Relaxation phase 0.5seconds
- 1.RA fills via VC 2.LA fills via pulmonary vein 3.Weight of blood forces open AV valves 4.Blood goes into ventricles
- Relaxation phase 0.5seconds
- Systole
- Contraction phase 0.3seconds
- 1.SA-AV=atriol systole pushes blood into ventricles 2.Av-Bundle of his-Purkinjie fibres 3.Causes ventricular systole 4.Semi-lunar valves shut
- Contraction phase 0.3seconds
- Diastole
- Conduction system
- Vascular
- Blood Vessels: 1.Arteries 2.Arteriols 3.Capilleries 4.Venuoles 5.Veins
- Vascular shunt
- Redistributionof blood around the body
- V.C.C
- Baroreceptorsdetecet increases in blood pressure
- V.C.C vasodilates arterioles and PCS to working muscles
- Pre Capillary Sphincters
- V.C.C vasoconstricts arterioles to non essential organs
- V.C.C vasodilates arterioles and PCS to working muscles
- Vasomotor Control Centre
- Baroreceptorsdetecet increases in blood pressure
- V.C.C
- Redistributionof blood around the body
- Venus return
- Returns blood to the heart
- Mechanisms: 1.Venoconstriction 2.Pocket valves 3.Gravity- above heart 4.Skeletal muscle pumps 5.Respiratory pumps
- 4+5 only for exercise
- Mechanisms: 1.Venoconstriction 2.Pocket valves 3.Gravity- above heart 4.Skeletal muscle pumps 5.Respiratory pumps
- Returns blood to the heart
- Heart
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