Blood vessels
- Created by: sophieamyx
- Created on: 26-06-17 18:27
View mindmap
- Blood vessels
- About the Valves in the heart:
- Pressure on the heart chambers depend on whether they are opened or closed
- High pressure behind a valve forces it open
- Therefore, blood only flows one way
- High pressure in front of a valve forces it shut
- High pressure behind a valve forces it open
- Pressure on the heart chambers depend on whether they are opened or closed
- Transport
- Arteries
- Carry blood from the heart to the rest of the body
- Thick walled, muscular
- Has elastic tissue to cope with high pressures
- Endothelial lining is folded, allows the artery to expand, helps with coping of pressure
- Veins
- Take blood back to heart under lower pressures than arteries
- Wider than equivalent arteries
- Has valves to prevent back flow of blood
- Body muscle contractions surround veins help blood flow through veins
- Capillaries
- Smallest blood vessel
- Metabollic exchange
- Substance are exchange between cells and capillaries
- Capillary beds (networks of capillaries in tissue)
- Increase surface area for exchange
- Walls one cell thick
- Speeds up diffusion of substances such as oxygen, glucose in and out of cells
- Arteries
- About the Valves in the heart:
Comments
No comments have yet been made