Cardiovascular Physiology #5 9/22/15 Flashcards
_______ is the same for all vascular beds.
Delta P (Perfusion pressure)
MAP = ? * This
Cardiac output x total peripheral resistance (TPR) *MAP = CO X TPR
What is TPR?
The sum of the resistances to flow offered by all the systemic blood vessels
Why is MAP important?
it determines organ blood flow.
Flow = ?
Flow = Change in pressure/resistance of arterials to that organ
Change in pressure = ?
= Flow x Resistance
CO = ?
Heart rate x Stroke volume
To increase heart rate, Sympathetic nervous system acts on______ receptors In the _____ and has what effect?
Beta-1 receptors
Atria
Increases Na+ entry, which increases heart rate.
How do Sympathetics regulate stroke volume?
Beta-1 receptors in the ventricles (Increases contractility and increases stroke volume)
Beta-1 receptors are in the _____, Alpha receptors are in the _______.
Heart
Vasculature
Blood loss causes a reduction in _______.
MAP, Ultimately b/c you are decreasing stroke volume, cardiac output,….
What happen if MAP drops?
Less blood flow to organs = not good!
What are Baroreceptors?
Neurons that function as homeostatic maintenance of MAP by constantly monitoring in the aortic arch and carotid sinuses.
How do Parasympathetics affect heart rate?
They act on muscarinic receptors in the atria, decreasing funny channel, decreasing heart rate.