Blood circulation
- Created by: Bethhy
- Created on: 14-04-14 14:38
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- Blood circulation
- Arteries
- carry blood away from the heart
- carry oxygenated blood
- except pulmonary artery, carrying deoxygenated blood from the heart to lungs.
- Lumen- gets smaller the further you go from the heart
- smallest being arterioles
- walls contain elastic fibres so they can stretch so they dont get damanged
- peripheral arteries- further from the heart
- Capillaries
- arterioles lead to cappillaries
- branch between cells
- diffusion can happen quickly through cells
- relatively small so blood moves slowly
- diffusion happens through opportunity
- walls are very thin, fit between cells
- one cell thick
- blood into capillary has lots of oxygen
- blood leaving the capillary has less oxygen
- Veins
- blood back to the heart
- deoxygenated blood
- except pulmonary vein- oxygenated blook to heart from lungs
- 2 veins carry back to the heart.
- inferior vena cava- lower parts of body
- superior vena cava- upper parts of body
- blood pressure inside is relatively low
- semilunar valves
- stop backflow
- circulation system
- single circulation
- heart pumps deoxygenated blood to the gills.
- fishhh
- heart pumps deoxygenated blood to the gills.
- double circulation
- need more oxygen
- maintain body temperature
- two circulation systems
- systemic circulation
- oxygenated to cells and deoxygenated to the heart
- pulmonary circulation
- deoxygenated from heart to lungs to be oxygenated
- systemic circulation
- single circulation
- Arteries
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