Human Digestive System

Carries food from mouth to stomach

thick muscular wall adapted for transport not digestion

oesophagus stomach small intestine

muscular sac inner layer produces enzymes

involved in storing and digesting food

proteins digested here glands produce mucus long muscular tube

mucus prevents enzymes digesting this organ

food digested by enzymes produced in walls and by glands that pour secretions in

the inner walls are folded into villi

villi produce a large surface area

surface area of villi increased by microvilli on epithelial cells of each villus

this increase of surface area means this organ is adapted for absorbing products of digestion into blood stream

Large Intestine Rectum Salivary glands

Pancreas water is absorbed here found near the mouth

food that leaves here is dry and thick and forms faeces

faeces are stored before being periodically expelled by anus through egestion

reabsorbed water mostly comes from secretions of digestive glands

pass secretions through a duct into the mouth

secretions contain the enzyme amylase

amylase breaks down starch to maltose

this is a large gland found below the stomach

produces pancreatic juice

this secretion contains proteases to digest proteins, lipase to digest lipids and amylase to digest starch

Human Digestive System