Week 10: Respiratory + Cardiovascular

Question 1

What restores ATP during heavy exercise?

Answer 1

creatine phosphate

Question 2

Explain the graph

Answer 2

During exercise your rate of oxygen uptake increases rapidly, once exercise has finished the oxygen uptake rate drops rapidly BUT not to zero and continues to decrease slowly until regular value is reached.

Question 3

Explain the anaerobic threshold

Answer 3

• When a muscle is contracting no blood flow is going through hence no circulation (local flow)
• in extracellular space, lactic acid builds up and once the contraction stops the circulation continues
• this lactic acid will promote more local flow to the muscle
• the lactic acid then goes back to the liver and goes through the cori cycle in which it is turned to glucose

Question 4

What is the problem with the anaerobic threshold?

Answer 4

it does not work indefinitely

too much lactic acid= low pH = metabolic acidosis

• ↑ CO₂ exhaled
• ↑ respiratory quotient
• ↑ ventilation
• extent of load close to maximal

Question 5

What is the respiratory quotient?

Answer 5

VCO₂/ VO₂

.8

Question 6

What parameters are effected by increased activity?

Answer 6

1. heart rate: ↑
2. stroke volume: no change
3. cardiac output: ↑
4. arterial pressure: ↑
5. total peripheral resistance: ↓
6. oxygen consumption: ↑