Biology, 26.10.2021 09:50, brenda9495
Robert decides to go for a run when he gets home from school. As he begins running, his breathing rate starts to increase. What are the mechanisms that cause his breathing rate to increase?
A. When carbon dioxide levels in the blood decrease, the respiratory center sends signals to the alveoli to increase the volume that they expand.
B. When oxygen levels in the blood decrease, the respiratory center sends signals to the diaphragm to increase the rate at which it contracts and relaxes.
C. The respiratory control center senses the need for more oxygen, which causes the trachea to push and pull air more forcefully.
D. The diaphragm senses the need for more oxygen, which causes it to expand and contract more quickly in order to inflate and deflate the lungs.
Answers: 2
Biology, 22.06.2019 14:00, veronicacalyn
If t=tall and t=short what will be the physical appearance of the offspring the cross below? a. some will be tall and some will be short b. they will all be tall c. they will all be short d. they will be medium height
Answers: 2
Robert decides to go for a run when he gets home from school. As he begins running, his breathing ra...
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