Y9 Biology - respiration

Oxygen debt

Extra oxygen needed after vigorous exercise to restore ATP and get rid of lactic acid. Breaks down lactic acid, transports into liver, where it’s converted to glucose, and normal ATP happens there

Aerobic vs anaerobic respiration

Oxygen, energy, products, location, glucose breakdown, when used

Breathing rate changes during exercise

Muscles work harder and need more energy → more rate of aerobic respiration→ more oxygen needed → produces more CO2 as a waste product →breathing rate and depth increase → take in more oxygen and remove carbon dioxide more quickly

Pulse rate changes during exercise

Pulse rate increases → oxygen and glucose move to muscles faster → more blood per minute → helps meet higher demands

Fermentation (anaerobic in yeast)

Glucose → ethanol + carbon dioxide

Maggot practical

Maggots in air tight tube, soda lime at opposite end absorbing OC2, gas volume decreases, pressure decreases, liquid in capillary tube moves further