Circulatory System
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- Created by: Lucy
- Created on: 02-10-13 17:34
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- Veins
- Circulatory System
- Open Circulation
- Blood is not enclosed in vessles
- Ostia- Small pores where gas exchange occurs and where blood re-enters the pump
- Open Circulation
- Circulatory System
- Tubular Heart is the 'pump' that pumps the blood into the empty space
- Open Circulation
- Blood is not enclosed in vessles
- Ostia- Small pores where gas exchange occurs and where blood re-enters the pump
- Open Circulation
- Has valves to prevent backflow
- Closed Circulation
- Circulatory System
- Circulatory System
- Blood always flows in vessels
- Closed Circulation
- Closed Circulation
- Single Circulatory System
- Eg. Fish
- Single Circulatory System
- Single Circulatory System
- Blood flows through the heart once per circulation
- Heart --> Gills --> Body --> Heart
- Double Circulatory System
- Eg. Mammals
- Pulmonary Circuit carries de oxygenated blood to the lungs
- Systemic Circuit carries oxygenated blood to body tissue
- Systemic Circuit carries oxygenated blood to body tissue
- Its easier to maintain a set temperature and control it
- Advantages
- Double Circulatory System
- Eg. Mammals
- Pulmonary Circuit carries de oxygenated blood to the lungs
- Takes oxygenated blood simultaneously at high pressure to all regions of the body
- The oxygenated blood reaches respiring cells quickly
- Double Circulatory System
- Advantages
- Arteries
- Carry oxygenated blood away from the heart
- Small Lumen
- The Elastic tissue wall can contract and constrict the Artery
- Capillaries
- Very thin Tunica Externa
- Takes blood very close to cells
- Goes from High pressure to low pressure
- Small Lumen
- A thick Tunica Externa to give it strength
- Arteries
- Carry oxygenated blood away from the heart
- The Elastic tissue wall can contract and constrict the Artery
- Arteries
- Carries blood under high pressure
- Endothelium cells can unfold when the artery streches
- Carry de oxygenated blood towards the heart
- Veins
- Veins
- Large Lumen
- Thin tunica externa
- Contains valves to prevent backflow
- No constriction of blood flow
- Carries blood at a low pressure
- Very thin Tunica Externa
- Walls are a single layer of cells making gas exchange very efficient
- Capillaries
- Takes blood very close to cells
- Goes from High pressure to low pressure
- Capillaries
- Small lumen
- Network of thing tubes which link Arteries to Veins and take blood close to cells for gas excahnge
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