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(a) Define respiration
(b) State three activities in human digestive system that depend on respiration.

Answer Text:
a)- It is the process by which food substances are broken down in the cells to release energy.
b)- Peristalsis due to contraction of smooth muscles to move food along digestive track.
- Secretion of digestive enzymes.
- Churning of food due to contraction of muscles to mix food and form chyme.