The following changes take place in the human body during exercise. 1 breathing rate rises 2 the respiration rate rises 3 nerve impulses are sent from the brain to the intercostal muscles and diaphragm 4 receptors in the brain detect a higher concentration of carbon dioxide in the blood What is the correct sequence for these changes?
- A1 $\rightarrow$ 2 $\rightarrow$ 4 $\rightarrow$ 3
- B1 $\rightarrow$ 3 $\rightarrow$ 4 $\rightarrow$ 2
- C2 $\rightarrow$ 1 $\rightarrow$ 4 $\rightarrow$ 3
- D2 $\rightarrow$ 4 $\rightarrow$ 3 $\rightarrow$ 1