Components of the digestive system The alimentary canal

• • Components of the digestive system The alimentary canal Digestive glands Human digestive system The digestive system of a rat Peristalsis The structure and functions of a villus

The digestive system in mammals Alimentary canal Digestive glands a tube from mouth to anus they produce enzymes for digestion

The alimentary canal oesophagus stomach large intestine small intestine rectum anus

Digestive glands • salivary glands saliva • gastric gland gastric juice • liver bile • pancreas pancreatic juice • intestinal gland intestinal juice

Human digestive system

Digestive system of a rat stomach small intestine liver large intestine

Peristalsis The rhythmic contraction and relaxation of • muscle behind the muscles of thethe gut wall to move food bolus along the alimentary canal contracts • muscle in front of the food bolus relaxes food bolus is pushed along the gut

Structure and function of a villus lacteal with blood transports one cell thick increase capillaries fats andarea surface and a lacteal glucose for absorption muscle wall

Summary The digestive system • is the system of organs that are involved in the process of digestion • is made up of the alimentary canal and associated glands Movement of food along the alimentary canal • by peristalsis Absorption of digested food • by villi