Made up of long muscular tube and its associated glands- the glands produce enzymes
the enzymes break down large moecules into small for absorption
digestion: process which large molecules are hydrolyses by enzymes into small molecules (can then be absorbed and assimilated)
Assimilated= convert (food) to substances suitable for incorporation into the body and its tissues
carries food from mouth to the stomach
adapted for transport rather tahn digestion or absorption
Made up of thick muscular wall
muscular sac with inner layer that produces enzymes
role= store and digest food (especially proteins)
glands that produce enzymes which digest protein
other glands in stomach wall produce mucus
mucus prevents stomach being digested by its own enzymes
long muscular tube
enzymes in the SI that are produced by its walls and by glands that pour secretions into it digest the food.
inner walls of SI are folded into villi which have tiny projections on their epthelial cells-microvilli= large surface is created this adapts the small intestine for absorbing the products of digestion into the bloodstream
most of the water that is reabsorbed comes from the secreations of the many digestive glands
food within LI therefore becomes drier and thicker in consistency- forms faeces
final section of intestines.
faeces are stored here before periodically being removed via the **** in a process called egestion.
situated near mouth
pass their secretions via a duct into the mouth
these secretions contain the enzyme amylase, which breaks down starch into maltose.
large gland situated below the stomach
produces a secretion called pancreatic juice
this secreation contains:
- proteases to digest proteins
- lipase to digest lipids
- amylase to digest starch