Lab 3: Cardiovascular Physiology

Question 1

What does a negative percent change of the P-R interval indicate?

Answer 1

Faster artrial contraction

Question 2

What does a negative percent change of the R-R interval indicate?

Answer 2

Faster heart cycle (faster heart rate)

Question 3

What does a positive percent change of the S-T interval indicate?

Answer 3

Slower ventricle contraction
maybe so that ventricles have more time to fill

Question 4

What happens when you stand up from a seated position?

Answer 4

Heart rate increases (R-R time decreases) to pump blood to the brain to compensate for blood pressure decrease.

Question 5

What happens to heart rate when:
Temperature is increased
Temperature is decreased
Alcohol is added

Answer 5

Temperature is increased: HR increases
Temperature is decreased: HR decreases
Alcohol is added: HR decreases (in our experiment it increased from room temp but decreased from hot)

Question 6

What happens to heart rate when:
Temperature is increased
Temperature is decreased
Ethanol is added

Answer 6

Temperature is increased: HR increases (24.5%)
Temperature is decreased: HR decreases (-34.7%)
Ethanol is added: HR decreases (in our experiment it increased from room temp but decreased from hot) (6.7%)