205 L13 Flashcards
Vascular haemodynamics
What is the equation for blood flow?
Blood flow (Q) = change in pressure (P) / resistance (R)
Blood flow to tissues is controlled in relation to tissue ——.
needs
When talking about the whole body blood flow = —– —–
cardiac output
To increase blood flow increase the —— of the blood vessel, or ————.
To increase blood flow increase width of blood vessel, or vasoconstrict.
Blood flow determines —— —- and —— —–
Blood flow determines heart rate and stroke volume
Pressure
Change in pressure = ___ x _____
MAP = —- x —-
Anything that increases , —- —, —— —– or ——– will increase pressure
Change in pressure = —— usually in theory because —– pressure is minimal so it can be ignored.
If cardiac output increases during exercise resistance decreases to maintain the same mean arterial pressure
Pressure
Change in pressure = blood flow x Resistance
MAP = CO x TPR
Anything that increases , blood flow, cardiac output or resistance will increase pressure
Change in pressure = MAP usually in theory because venous pressure is minimal so it can be ignored.
If cardiac output increases during exercise resistance decreases to maintain the same mean arterial pressure