*Respiration is the chemical process in which cells exchange oxygen and carbon dioxide to obtain energy, Air is breathed in and diffusion occurs and carbon dioxide is breathed out
*Breathing is controlled by muscles.
*[H+] and [CO2] are too high, medulla oblongata is stimulated > sends impulse to diaphragm and intercostal muscles > diaphragm contracts > ribs move up and out > diaphragm moves down > air rushes in > vice versa for exhalation
• controlled by medula oblongata
*inhale through mouth or nose, are is filtered by cilia and mucus in nose, then the air goes to the pharynx, past the epiglottis, and through your larynx and trachea, at the base of the trachea are two tubes called bronchi which branch off into smaller air tubes called bronchioles, then the air reaches tiny sacs called alveoli where gas exchange occurs