Archive for the ‘Biology’ Category

How do breaths/min and Peak flow change with exercise and why?

Wednesday, November 25th, 2009
chuckles asked:


And Is it to do with Oxygen requirements of the tissues for cellular respiration?

What takes place in the human body when the heart rate increases because of exercising?

Saturday, November 21st, 2009
C. Hazel asked:


a) more oxygen is delivered to muscle cells
b) blood cells are excreted at a faster rate
c) the rate of digestion increaeses
d) no hormones are produced

As you exercise intensely, your body temperature increases slightly.How this affect process of diffusion?

Wednesday, November 11th, 2009
BABEZZZZ asked:


Your lungs are constantly exchanging oxygen and carbon dioxide between your body cells and your blood cells by diffusion. As you exercise intensely, your body temperature increases slightly. How does this affect the process of diffusion?

A. The rate of diffusion increases due to your slightly higher body temperature.
B. The rate of diffusion decreases due to your slightly higher body temperature.
C. The rate of diffusion is unaffected by changes in temperature.
D. Diffusion stops completely during periods of over-exertion.

Which of the following would normalize the increase in pH due to strenuous exercise?

Sunday, November 8th, 2009
joshlee asked:


a. decrease in breathing rate
b. increase in heart rate
c. decrease in amount of oxygen unloaded from hemoglobin
d. decrease in cardiac output
e. decrease in CO2 binding to hemoglobin

Is “c” or “e” possible? Anything to do with Haldane Effect?
Please explain the correct and incorrect choices. Thank you so much.

josh

What effect does exercise have on a person?

Sunday, October 18th, 2009
hi asked:


A- it decreases the amount of oxygen needed by the blood

B- it decreases heart size, increasing the strength of contractions

C- It decreases the heart output and work the heart muscle must do

D- It decreases the amount of cholesterol/fat in the blood vessels

Why does blood flow to the brain needs to be increased during exercise?

Friday, October 16th, 2009
shakkill asked:


I have heard answers like to bring more oxygen or it just happens because blood is being pumped at a faster rate. But what is the significance of blood being pumped to the brain at a faster rate.