Blood Vessels
- Created by: emily.tx
- Created on: 05-04-17 11:19
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- Blood Vessels
- Arteries
- Carry blood away from the heart
- Structure
- elastic fibres allow them to withstand the force of blood pumped out of the heart and to stretch and recoil in-between contractions of the heart
- Endothelium (lining) is smooth so blood flows easily over it
- Thick walls of collagen for support and to withstand high pressure of blood
- Small Lumen
- Carry oxygenated blood except in the pulmonary artery which carries deoxygenated from the heart to the lungs
- Veins
- Carry blood to the heart away from the cells
- Carry deoxygenated blood (with 2 exceptions). Pulmonary vein carries oxygenated blood to the heart from the lungs and the umbilical vein carries oxygenated blood from the placenta to the foetus.
- Structure
- Blood pressure is low compared to the arteries
- Medium size veins have valves to prevent backflow
- Wide lumen and smooth endothelium for easy blood flow
- Contain a large amount of collagen for support but don't have much elastic fibre
- Arterioles
- Link the arteries to capillaries
- Have more smooth muscle but less elastin in their walls than arteries
- When the smooth muscle contracts it constricts the vessel and prevents blood flowing into a capillary bed- Vasoconstriction
- Arteries
- Link capillaries to veins
- Venules
- Thin walls with little smooth muscle
- Several venules join to form a vein
- Blood Vessels
- Arteries
- Carry blood away from the heart
- Structure
- elastic fibres allow them to withstand the force of blood pumped out of the heart and to stretch and recoil in-between contractions of the heart
- Endothelium (lining) is smooth so blood flows easily over it
- Thick walls of collagen for support and to withstand high pressure of blood
- Small Lumen
- Carry oxygenated blood except in the pulmonary artery which carries deoxygenated from the heart to the lungs
- Veins
- Carry blood to the heart away from the cells
- Carry deoxygenated blood (with 2 exceptions). Pulmonary vein carries oxygenated blood to the heart from the lungs and the umbilical vein carries oxygenated blood from the placenta to the foetus.
- Structure
- Blood pressure is low compared to the arteries
- Medium size veins have valves to prevent backflow
- Wide lumen and smooth endothelium for easy blood flow
- Contain a large amount of collagen for support but don't have much elastic fibre
- Arterioles
- Link the arteries to capillaries
- Have more smooth muscle but less elastin in their walls than arteries
- When the smooth muscle contracts it constricts the vessel and prevents blood flowing into a capillary bed- Vasoconstriction
- Arteries
- Venules
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