The main factor that controls the rate of breathing is..
A.) concentration of carbon dioxide.
If we think about it.. When we breath in oxygen, right away it enters your lungs and turns into carbon dioxide. Well since your lungs need to process oxygen and bring oxygen into the blood stream. Then as soon as the oxygen comes inside (inhale) the oxygen turns into carbon dioxide and you breath it out (exhale) to get a new oxygen load.
Makes sense? lol
Good Luck! :)
Answer:
33 minutes
Explanation:
The principle of progression suggests that overload must be increased using frequency, intensity, time and type, when your present routine of exercise is no more felt by your body. Hence since Sally is jogging three times per week for 30 minutes, she could either increase it to jogging same 3 times a week, but instead increase her time by a factor of three to 33 minutes.
I took the quiz, the answer is: They must be obtained through diet.
