Blood Pressure, Resistance, and Flow Flashcards
How is blood supply expressed
Flow and perfusion
Blood supply is expressed in terms of flow and perfusion. What is flow?
The AMOUNT of blood in a place at a given time.
What is perfusion?
The flow per volume of tissue. AKA blood flow got the blood to the area, now where is it going exactly?
Blood flow is equal to
Cardiac output
The greater the pressure difference between two points…
The greater the flow
The greater the resistance
The less flow
What artery is used to measure blood pressure
Brachial artery
What is the device that takes blood pressure from your brachial artery called
Sphygmomanometer
As the heart creates a pressure gradient, arteries
Pulsate
Capillaries and veins have a __ flow because they do not have the heart to create a pressure gradient
Steady
Arteriosclerosis
Stiffening of the arteries
Atherosclerosis
Lipid build up in the arteries
What is high pressure starts at
140/90
Why is high bp so bad?
Weakens arteries, can cause aneurysms, atherosclerosis
What 3 things determine blood pressure
Cardiac output, blood volume, resistance to flow
Cardiac output is
The amount of blood the heart pumps in one minute
Who regulates blood volume (pee)
Kidneys
What is it called when the walls of arteries create friction that slows down blood
Peripheral resistance
What 3 things contribute to peripheral resistance
Blood viscosity, vessel length, vessel radius
What two things mostly contribute to blood viscosity
RBC and albumin
Polycythemia
too much rbc
