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The Heart and Circulation

Cardiac Cycle:

1. Atrial Systole (contraction), Ventricular Diastole (Relaxation)
2. Atrial Diastole, Ventricular Systole
3. Atrial Diastole, Ventricular Diastole


Arteries: Elastic fibres to withstand pressure, recoil to absorb pressure.

Arterioles: Muscley to constrict or dilate, controls blood supply to specific areas.

Capillaries: Thin, permeable, allows…

Page 2

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HIGH->Nervous impulse to medulla oblongata->Sympathetic Nervous System->SAN

LOW-> Nervous impulse to medulla oblongata->Parasympathetic Nervous System->SAN


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