Heart
- Created by: emma
- Created on: 17-03-14 21:05
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- Heart
- Structure
- Deoxygenated blood returns from body via vena cava and enters right atrium
- Passes through right atrio ventricular valves in to right ventricle
- Then passes into the pulmonary artery via the semi lunar valve
- Passes through right atrio ventricular valves in to right ventricle
- Oxygenated blood returns from lungs via the pulmonary vein and enters left atrium
- Passes through left atrio ventricular valve into left ventricle
- Then passes into aorta via semi lunar valve
- Passes through left atrio ventricular valve into left ventricle
- Deoxygenated blood returns from body via vena cava and enters right atrium
- Pressure
- Blood enters atrium which increases pressure in atrium to be greater than in ventricle
- Atrio ventricular valves open
- Blood enters Ventricle which increases pressure in ventricle to be greater than in atrium
- Atrio ventricular valves close
- Blood enters Ventricle which increases pressure in ventricle to be greater than in atrium
- Atrio ventricular valves open
- Ventricles contract increasing pressure in ventricle to be greater than in aorta/ pulmonary artery
- Semi lunar valves open
- Ventricle relaxes so pressure in ventricle less than aorta/ pulmonary artery
- Semi lunar valves close
- Ventricle relaxes so pressure in ventricle less than aorta/ pulmonary artery
- Semi lunar valves open
- Blood enters atrium which increases pressure in atrium to be greater than in ventricle
- Cardiac cycle
- Sino atrial node sends out electrical impulse across right atrium wall
- Causing it to contract
- Non conducting fibres prevents electrical impulse passing into ventricles
- Allow time for atria to empty
- Atrio ventricular node sends electrical impulse down bundle of His
- Cuasing ventricles to contract
- Sino atrial node sends out electrical impulse across right atrium wall
- Cardiac output
- CO=SV*HR
- Heart rate
- number of cardiac cycles per minute
- Stroke volume
- Volume of blood expelled from the left ventricle in one heart beat
- Cardiac output
- Volume of blood expelled from left ventricle in one minute
- Heart rate
- CO=SV*HR
- Atheroma
- Cholesterol builds up
- Gathers under endothelium of artery
- Atheroma causes blood clots
- Blocks coranory
- Reduces O2 and glucose to cells so they cant respire and die
- Blocks coranory
- Atheroma causes blood clots
- Gathers under endothelium of artery
- Cholesterol builds up
- Thrombosis
- Plaque ruptures and triggers blood clott
- This blocks the artery
- Plaque ruptures and triggers blood clott
- Aneurysm
- Artery becomes blocked blood flow through area is restricted
- Pressure builds up
- Cause artery wall to weaken and it starts to buldge outwards
- Pressure builds up
- Artery becomes blocked blood flow through area is restricted
- Structure
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