Electrocardiography, Dr. D. Penney

Table 3. HEART FUNCTION

2 pumps joined by common septum, driven by common pacemaker.

4 valves: 2 AV & 2 semi-lunar.

Blood flow: nutritive (coronary), non-nutritive (that pumped).

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Atria -

Blood reservoirs (mainly) (resting heart rate), function as continuations of major veins.

Pump filling ventricle (higher HR's)

Ventricle -
Connecting link between low & high pressure systems; to receive blood from atrium it must decrease its pressure, & to send blood to arteries it must raise its pressure.
Four phases of cardiac cycle:
1) pressure increases
2) volume decreases
3) pressure decreases
4) volume increases

Aorta -
Conduit to arteries, arterioles, capillaries
Pressure reservoir

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Atria -	Blood reservoirs (mainly) (resting heart rate), function as continuations of major veins. Pump filling ventricle (higher HR's)
Ventricle -	Connecting link between low & high pressure systems; to receive blood from atrium it must decrease its pressure, & to send blood to arteries it must raise its pressure. Four phases of cardiac cycle: 1) pressure increases 2) volume decreases 3) pressure decreases 4) volume increases
Aorta -	Conduit to arteries, arterioles, capillaries Pressure reservoir