All of the following are possible EXCEPT
a. an involuntary increase in the rate of breathing.
b. a voluntary increase in the rate of breathing.
c. inhibition of the respiratory centers in the brain.
d. a voluntary decrease in the rate of breathing.
e. voluntarily holding one's breath until death occurs.

How does oxygen move from the respiratory system to the circulatory system? a. by pumping through the heart b. by circulating in an artery c. by moving across a synapse d. by diffusion across a capillary wall

Are produced in the light reactions and used in the calvin cycle. a)nadh and atp b)electrons and sugar c)nadt+ and adp d)sugar molecules

Which of the following is the best definition of aerobic respiration? o a. the cellular process that releases energy by breaking down glucose o b. physical activity that involves the repeated motion of large muscle groups o c. physical activity that increases heart rate and breathing rate o d. the cellular process that converts solar energy to chemical energy