Temporary cessation of breathing after forced deep breathing for a few minutes, by a person sitting at rest is due toA. Too much oxygen in the bloodB. Too much carbon dioxide in the bloodC. Very little carbon dioxide in the bloodD. Both, too much oxygen and very little carbon dioxide in the blood

The temporary cessation of breathing after forced deep breathing for a few minutes, known as "apnea," is primarily due to option B: Too much carbon dioxide in the blood.

When a person engages in forced deep breathing, they exhale more carbon dioxide than usual. This can lead to a decrease in the level of carbon dioxide in the blood, a condition known as hypocapnia. This decrease in carbon dioxide can temporarily suppress the respiratory drive, leading to apnea.

Options A and D are not correct because having too much oxygen in the blood (hyperoxia) or very little carbon dioxide (hypocapnia) are both conditions that can suppress the respiratory drive and lead to apnea. Option C, very little carbon dioxide in the blood, could potentially contribute to the apnea, but the primary cause is the imbalance created by forced deep breathing leading to hypocapnia.