The Circulatory System

• The circulatory system consists of the heart and the blood vessels (veins, arteries and capillaries).
• Veins bring blood away from the heart. They have a wider lumen and thinner walls than arteries, and valves to prevent backflow... (More)

The Skeleton and Muscles

• The functions of the skeleton are support, protection and movement.
• Muscles are attached to bones. When they contract they alow us to move.
• Bone is made of living cells. and calcium compounds The living part of... (More)

Digestion

• The five stages of digestion are ingestion, digestion, absorpbtion, assimilation and egestion.
• Ingestion is the taking of food into the mouth.
• Digestion is the breaking down of food.
• Absorpbtion is the absorpbtion of molecules of food into the blood... (More)