Physiology Exam 4

The stroke volume is the volume of blood ejected during a single cardiac contraction.

SV = EDV - ESV

The cardiac output is the blood flow per unit time (L/min).

CO = SV * HR


(Cardiac index = CO/BSA)

Stroke work is the amount of work the heart does during a single contraction.

SW = VPP * SV


(whereas the RV and LV SV & CO are equal, their SW is different because of differences in pressure)

Basis:

Flow = Quantity consumed/(Arterial content - Venous content)

Thus:

Cardiac Output = O₂ Consumption/(a_o2 - v_o2)