Vascular Shunt Flashcards
What is the definition of vasc. shunt?
The redistribution of blood around the body
Where is most of the blood at rest?
Organs
Where is most of the blood during exercise?
Muscles
Why is vasc. shunt necessary?
To ensure there is enough blood to carry the required amount of oxygen to the muscles and take the CO2 away
What part of the brain controls vasc. shunt?
Vasomotor control centre in medulla
How is vasc. shunt controlled?
Chemoreceptors send msg to vasomotor centre
Vasomotor centre stimulates sympathetic nerves
What is A-V difference?
Arterial Venous Oxygen Difference
What is A-V difference?
Difference in O2 content from arteries and O2 content in venous blood
How great is the A-V difference at rest?
Low
How great is the A-V difference during activity?
High (bc musc. need more blood)
What does the difference indicate?
The amount of O2 used up by the muscles
