The answer is Both 1 and 3
I think the correct answer from the choices listed above is the first option. If you want to improve your muscular strength, then the best plan would be to make low resistance with high reps. Hope this answers the question.
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! :)
All of the above is your answer
