The Circulatory System B2.3
- Created by: Revise17
- Created on: 19-05-16 21:12
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- The circulatory System
- Blood vessels are tube shaped organs that carry blood
- artery- carries blood away from the heart
- High pressure so that the blood can reach all parts of the body
- thick strong walls enforce this pressure
- High pressure so that the blood can reach all parts of the body
- Capillaries allow substances to diffuse into and out of blood, into the cells in tissues
- They have very thin wall s ( one cell thick) to make diffusion more effective and efficient
- very low blood pressure
- found in muscles and lungs
- They have very thin wall s ( one cell thick) to make diffusion more effective and efficient
- Veins are blood vessels that have wide passages inside them because the blood flows relatively slowly under low pressure from an organ to the heart
- have valves to prevent blood flowing backwards
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