Lecture 11 - Controlling regional blood flows Flashcards
What is arterial BV and P determined by?
The input and output of blood
- More input = more P
What determines MAP to some extent?
Filling of blood
What controls BF around the system
Resistance
What is MAP imp for?
-flow and diffusion
- Enough P to maintain a flow
What is diiffusion aid in
O2–> Cell –> mito –> ATP
What is the heart
Two pumps in a series
–> systemic is from left side
–> Lungs is from right
Design of systemic circulation that allows blood to go to all organs
Parallel design
Why is gut blood flow diff
Blood goes through the GI tract then the liver as the liv cleans
Why are Arterioles like taps?
They can control the amount of blood that flows to diff organs
–> allows the right amount of blood to reach the organs
Why do we need to change distribution of blood?
When we do different activities, eg sport needs more blood to the muscles etc so changes distribution by altering the tap i.e the arterioles
What happens when we exercise?
We need CO to ^ as more O2 needs to be delivered for work to be done
- BF to muscles ^
- 80% of our food turns to heat (20% into atp). Heat is lost through cutaneous BF
- Heart does more work so coronary flow ^
- HR + SV ^
Advantages of parallel system
Choose where the BF goes
- Direct to the organs thatt help to survive
What flow is constant
Brain flow
When we exercise…
We circulate blood more quickly
To maintain MAP during exercise, what happens
Vasodilation to allows easy flow to where it needs to go so MAP isnt through the roof
