Cardiovascular Control Mechanisms Flashcards
(1 cards)
1
Q
Define cardiac output, stroke volume and mean systemic arterial pressure and state their determinants
A
ΔP= Q X R
Blood pressure (MAP)= Cardiac output (CO)- resistance (PVR)
The relation is an approximation because it assumes;
Steady flow ( which is not the case due to the intermittent pumping of the heart)
rigid vessels
right atrial pressure is negligible
Physiologically regulation of flow is achieved by variation in resistance in the vessels while blood pressure remains relatively constant
