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BIOLOGY TOPIC 6 HUMAN PHYSIOLOGY

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Pregunta:

Describe the cardiac cycle (sis , diarrhea) (4)

Autor: Sammy Universe



Respuesta:

A heart beat is made up of contraction (systole) and relaxation (diastole) contraction = increases P in atria and ventricles = blood flows from area of high pressure to low pressure Systole: when ventricles contract, AV valves close to stop backflow into atria = blood into arteries (1st sound) bicuspid and tricuspid valves close Diastole: when ventricles relax, semilunar valves close = stops backflow into ventricles = blood into arteries (2nd sound) blood flows out of the heart through the arteries (pulmonary and aortic arteries)


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a heart beat is made up of contraction (systole) and relaxation (diastole)

contraction = increases P in atria and ventricles = blood flows from area of high pressure to low pressure

Systole: when ventricles contract, AV valves close to stop backflow into atria = blood into arteries (1st sound) bicuspid and tricuspid valves close

Diastole: when ventricles relax, semilunar valves close = stops backflow into ventricles = blood into arteries (2nd sound)

blood flows out of the heart through the arteries (pulmonary and aortic arteries)
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