Heart

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Atrial systole; blood returns to heart due to gaseous exchange
Blood, low pressure, flows into left + right atria from pulmonary veins + vena cava. Atria fills, pressure on artrioventricular valves> push open, blood> ventricles. Atria walls contract, more blood> venticles
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Ventricular Systole; immediately after atrial systole
Ventricles contract from bast of heart upwards, increase pressure in ventricles. Pushes blood up and out through arteries. Pressure of blood against artioventricular valves closes them, prevents back flow of blood into atria.
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Diastole
Atria and ventricles relax, elastic recoil lowers pressure. Blood under high pressure in arteries drawn towards ventricles. Semilunar valves close. Coronary arteries fill. Low pressure in atria> blood drawn into heart from veins.
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Atherosclerosis
Fatty deposits block artery or increase blood clot. Blood supply blocked for long time> fatal> cells permanently damaged. Supply heart> myocardial infarction. Supply brain> stroke. Death/damage to cells. Tissue death/decay. Artery burst.
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Atherosclerosis; course of events
Endothelium damaged(high blood pressure) Inflammatory response White blood cells> artery wall. Deposit builds up, atheroma. Hard swelling (plaque), wall hardens. Arteries narrow, high B pressure, Blocked artery tissue has less oxygen so cant function
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Blood Clot
Damage wall of blood vessel> release collagen> platelets stick to wall> prothrombin converts to thrombin. Thrombin(enzyme) catalyses fibrinogen into fibrin. Fibrin mesh traps blood cells> blood clot.
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Atherosclerosis; only in arteries
Fast flowing blood in arteries is under high pressure, chance of damage to the walls. The low pressure in veins means less risk of damage to the walls
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Coronary heart disease
Narrowing coronary arteries, limits oxygen to heart. Chest pain(angina). Heart forced respire anaerobically. Trigger pain. If fatty plaques ruptures, cholesterol released, clot form. Heart blood supply blocked no oxygen permanent damage, heart attack
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Stroke
Supply of blood to brain interrupted briefly causes mini stroke. Full recovery can happen quickly. Mini stroke is warning of problems with bloody supply to the brain and could result in a full stoke in the future.
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Card 2

Front

Ventricular Systole; immediately after atrial systole

Back

Ventricles contract from bast of heart upwards, increase pressure in ventricles. Pushes blood up and out through arteries. Pressure of blood against artioventricular valves closes them, prevents back flow of blood into atria.

Card 3

Front

Diastole

Back

Preview of the front of card 3

Card 4

Front

Atherosclerosis

Back

Preview of the front of card 4

Card 5

Front

Atherosclerosis; course of events

Back

Preview of the front of card 5
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