The Circulatory system:
- Supplies oxygen and digested food to all parts of the body quickly
- Is made up of the heart - the pump that pumps blood to all parts of body, blood vessels - Veins, Arteries, and the Capillaries, Blood
Organ: Heart
Function: acts like a muscular pump that contracts and relaxes to pumps blood to all parts of body, has valves to prevent the backflow of blood.
Organ: Blood vessels
- Veins
- Arteries
- Capillaries
Function/ : Veins - transports mainly deoxygenated blood towards the heart
Feature - has thin walls as the pressure is low
Arteries - transports mainly oxygenated blood away the heart
- has thick walls as the vessels need to withstand the pressure caused by the pump of the heart
Capillaries - very thin blood vessels located between the cells of our body
- has very thin walls to allow substances to pass through to and fro the cells and blood
Organ: Blood
Function/ : Plasma - yellow liquid made up of mainly water and dissolved substances like digested food
Feature White blood cells - kills bacteria and fight diseases
- larger than red blood cells, live for only a few days
Red blood cells - transports oxygen around the body - biconcave shaped so as to increase the surface area of the cell and to increase the rate of exchange of oxygen
- has no nucleus
- Contain a red pigment - hemoglobin ( iron )
- Contain a red pigment - hemoglobin ( iron )
Platelets - tiny pieces of other blood cells
- clot blood when there is wounds
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