what is cardiovascular drift and starlings lav and a-vo2 difference

Question 1

what is ejection fraction

Answer 1

the percentage of blood pumped out by the left ventricle per beat

Question 2

what is starlings law/ how does stroke volume increase during exercise

Answer 2

during exercise increase in venous return, greater diastolic filling of the heart, therefore cardiac muscle stretches resulting in more forceful contraction resulting in increased ejection fraction/stroke volume

Question 3

what is cardiovascular drift

Answer 3

progressive decrease in stroke volume and arterial blood pressure with a rise in heart rate

Question 4

why does cardiovascular drift occur

Answer 4

due to prolonged exercise in a warm environment, blood plasma is lost in the sweat therefore reducing venous return and stroke volume, to maintain cardiac output heart rate has to increase

Question 5

what is arteriovenous oxygen difference

Answer 5

difference between oxygen content of the arterial blood arriving at the muscles and that of the venous blood leaving the muscles

Question 6

why does arteriovenous difference increase during exercise

Answer 6

as more oxygen is extracted by muscles to be used for energy, regular training increases this meaning performers can extract a greater amount of oxygen from the blood