Respiration and Gas Exchange
Respiration: respiration is NOT breathing in and out, respiration is what happens in each cell of the body, it is the process of releasing energy from glucose and the energy is released as chemical and heat energy.
Aerobic Respiration needs plenty of oxygen: It only happens when there is a plentiful supply of oxygen and is the most efficient way to release energy from glucose.
Anaerobic Respiration doesn’t use Oxygen at all: when you are doing vigorous exercise your body can’t get enough oxygen in at the rate it’s being used so you start to respire anaerobically. If the lactic acid builds up in muscles it’s painful.
Anaerobic respiration in plants is slightly different, plants can respire without oxygen too and they produce ethanol (alcohol).
Investigation of Respiration