respiratory system physiology

define respiration

the exchange of oxygen and carbon dioxide between an organism and the external environment

define external respiration

the actual act of breathing

define internal respiration

cellular respiration - utilisation of oxygen by cells in metabolism

give some functions of the respiratory system

gaseous exchange - O2 and CO2

olfaction - by specialist nerve endings in nasal cavity transmitted to brain via olfactory nerve

speech - via vocal cords in the larynx

homeostasis - via O2 and CO2 exchange

protection - via immune system and mucus production

what is olfaction?

sense of smell

outline the functio