Lecture 11 Flashcards
How many letters of blood is pumped per minutes
5L - amount of blood in body
In order to have a controlled (and a variation of) flow you must have
Pressure (high)
- need a driving pressure
Cardiac output is ______ to all organs
Distributed
The parallel design of systemic circulation:
- continual branching of arterial network
- divides blood flow among the regional (organ) circulations
Distribution of cardiac output at rest - dont memorise numbers
Distribution of cardiac output during exercise
- it I spread around as needed especially skeletal muscle and gut
- learn arrows at side
- increasing heart rate increasing stroke volume
- brain blood flow the same
Diretubution of cardiac output yappage
- parallel branches
- because of arterioles we can chose which ones we open and close meaning you can get a sensible distribution while at rest and then push into places of Ned during exercise
During exercise there is an increase in blood flow to:
- muscle
- heart
- skin
During exercise there is a decrease in blood flow to:
- GI tract
- kidneys
During exercise there is a constant blood flow to:
Brain
Divergent flow depending on
Metabolic needs
The only this that allows us to redistribute the blood is
The parallel circuit
How is MAP controlled during excise
Systemic circulation:
- increased cardiac output
- decreased TPR (vascodilation)
- constant mean arterial pressure (MAP)
MAP = CO x TPR
Resistance in muscle vs kidney in rest and eversise
Muscle:
- increased flow = decreased resistance
Kidneys:
- decreased flow = increased resistance
Control of arterioles (resistance vessels) to change resistance
- contraction and relation of smooth muscle (precapillary sphincters)
Resistance to blood flow and vessel radius - equation
How blood flow to an organ or region is controlled by adjusting arteriolar ‘ vascular’ tone and radius
