2.1 Respiration releases energy for cells
from glucose. This can be aerobic
respiration, which needs oxygen, or
anaerobic respiration, which does not.
During exercise, the breathing rate and
heart rate increase. During hard
exercise an oxygen lack may build up.
2.2 Aerobic respiration happens all the
time in the cells of animals and
plants. Most of the reactions
involved happen inside mitochondria,
tiny objects inside the cytoplasm
of the cell. The reactions are
controlled by enzymes.
2.3 Plants make amino acids from
sugars, nitrates and other nutrients.
Glucose is a sugar.These amino acids
are then compacted into larger
molecules - proteins
2.4 Respiration needs to be high
speed in exercise to maintain