Exercise

Question 1

What is the respiratory quotient?

Answer 1

CO2:O2 ratio

Question 2

What is the average humans oxygen requirement?

Answer 2

3.5 ml/min/kg of oxygen

Question 3

What happens to SV as exercise increases?

Answer 3

Initially increases then decreases.

However, HR increases continuously so CO increases.

Question 4

CO increases 4-7 fold during exercise. Oxygen consumption increases 10-15 fold. Which 2 mechanisms contribute to this?

Answer 4

More oxygen in blood, and also more oxygen extracted from blood (rest = 75-80%. exercise = 85%).

Question 5

What is the Fick Equation?

Answer 5

VO2 = CO x O2 extracted

Question 6

What is the lungs response to incremental exercise?

Answer 6

Breathing volume increases unto a point (like SV), then decreases. Breathing rate continues to increase so total ventilation increases.

Question 7

In exercise, better perfusion/ventilation matching.

Answer 7

Improves arterial O2 concentration