Diffusion = down the gradient: O2 goes in, CO2 goes out.
1. What is diffusion in the context of breathing and gas exchange?
2. Where does gas exchange occur between air and blood?
3. What does the autonomic nervous system do in respiratory control?
Gas exchange — definition?
Transfer of oxygen and carbon dioxide between air and blood.
Autonomic nervous system — role?
Regulates involuntary functions like breathing.
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