Vascular Shunt Mechanism Flashcards
What does ‘Q’ mean?
Distribution of cardiac output
During exercise what does the cv do?
Distributes the blood to the working muscles during exercise
At rest how much blood each
Muscles-20%
Organs-80%
Where and how much blood goes to body?
80% is supplied to muscles
20%- organs (mainly brain as it needs to control muscle actions that are being produced)
What does the vaso control centre control?
The Vascular Shunt Mechanism
What’s the role of chemoreceptors?
Inform the brain thst the lactic acid has increased and co2 levels. Oxygen levels have decreased (chemical changes)
What’s the role of the Bororeceptors?
Informs the brain that systolic blood pressure levels have increased
What are veins?
Blood vessels that carry the blood to the heart
Arteries?
Blood flowing from the heart
Where does superior vena cava receive blood from?
Receives blood from the head, neck and chest
Where does the inferior vena cava receive blood from?
Receives blood from the trunk and lower limbs
What is the role of valves?
To prevent blood back flow
Which valve is in the right atrium?
Tricuspid valve
What is the vascular control centre?
The vcc controls the vascular shunt mechanism
What is the role of the sympathetic nervous system?
Increases the sympathetic nerve information, vasoconstrictor arterioles to organs to reduce the amount of blood going to them and vasodilation to the muscles to receive more blood during exercise
What is venous return?
Basically veins that carry blood back to the heart, during exercise venous return is massive.
What is the disadvantage of venous return?
Gravity always tries to pull blood down, this is why pocket valves are in use to reduce this from happening.
What is the muscle pump mechanism?
During rest, veins travel in between muscle groups, when muscle is relaxed vein is open and blood will collect.
During exercise- when muscles contract, muscles bulge out and squeeze the vein which will squeeze the blood back to the heart
What happens when theres more contractions?
Increases pressure
What is blood poling?
VR requires a force to push blood back to the heart, if no pressure blood will sit in pocket valves (heavy legs) Good for cool down
How is Sv increased?
During exercise theres a greater q because the athlete requires more blood and oxygen to be required to the muscles, increase In blood helps to remove lactic acid etc. Heart beats faster during exercise so more waste products get out of body.