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Circulatory System
key words for circulatory systems
Term | Definition |
---|---|
Transport system | living things need this to carry substances around body |
circulatory system | the human transport system also known as . contains blood, blood vessels and heart. |
heart | muscular pump. sends blood all around body |
structure of the heart | 4 chambers. 2 atrium and 2 ventricles. divided down middle. 4 valves so blood flows backwards. |
blood vessels | 3 types. Arteries. Veins and capillaries. |
arteries | carries blood away from heart |
veins | carries blood towards heart |
capillaries | connects veins and arteries |
valves | prevent backflow |
blood | 3 main functions. transport , defence against infection and clotting |
plasma | 95 percent water and 3 types of cells suspended. |
red blood cells | most common. give blood its colour. contain chemical haemoglobin. this chemical carries oxygen through the body . it doesn't have nucleus. |
white blood cells | fewer . no definite shape. fights diseases in body and has a nucleus. |
3 platelets | tiny parts of cells. Are used to clot cuts. NO definite shape. has a nucleus |
Human body temp. | 37 degrees celcius |
pulse rate |