8332126
Description
Mind Map by Molly Barton, updated more than 1 year ago
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Created by Molly Barton
about 7 years ago
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Circulatory System
- Vessels
- Arteries
- Carry blood AWAY from the heart
- Thick and muscular walls-resists damage due to high pressure
- Elastic tissue to stretch and recoil-maintains high pressure
- Folded endothelium layer-allows stretching to
maintain high pressure
- Also smooth to reduce friction
- Also smooth to reduce friction
- Arterioles
- Contract to restrict flow and relax to
aloow flow to organs
- Contract to restrict flow and relax to
aloow flow to organs
- Carry blood AWAY from the heart
- Veins
- Take blood INTO heart
- Low pressure
- Wide lumen
- Little elastic and muscle tissue
- Valves stop back flow of blood
- Take blood INTO heart
- Capillaries
- One cell thick-increases rate of diffusion
- Large number to increase surface area
- Numerous and Branched- increases surface area
- Narrow diameter- ensures RBC in contact with wall
- Wall spaces- gaps between cells allow
rapid formation of tissue fluid
- One cell thick-increases rate of diffusion
- Arteries
- Tissue Fluid
- Surrounds cells in tissues
- Made from small molecules (oxygen, water and nutrients)
- No big proteins- too large to
push through capillary walls
- Cells take in O2 and nutrients
from T.F. and release metabolic
waste into it
- Fluid leaves capillaries at arteriole
end but large proteins remain-due
to larger force pushing out than
forces pulling in
- Lower water potential in venule end than
in tissue fluid
- Force pulling in is stronger than force
pushing out
- Water moves into capillary via osmosis
- Excess T.F. is drained into LYMPHATIC SYSTEM
- Excess T.F. is drained into LYMPHATIC SYSTEM
- Water moves into capillary via osmosis
- Force pulling in is stronger than force
pushing out
- Lower water potential in venule end than
in tissue fluid
- High blood pressure = High hydrostatic pressure
- Surrounds cells in tissues
- Cardiac Cycle
- 1. When ventricle relaxes, the atria
contracts-decreasing volume and increasing
pressure. This pushes blood into the ventricles.
AV valve opens and SL valves close.
- 2. Atria now relax. Ventricles contract (decreasing
volume and increasing pressure). Pressure is
higher in ventricles than atria so AV valves shut
(stops back flow). Pressure in ventricles higher
than Aorta so SL valves open
- 3. Both ventricles and atria relax. Higher pressure in
Aorta (than ventricle) close SL valves (stops back flow). Atria fill again
due to high pressure in Vena Cava. Increases
pressure in atria. Ventricles relax so pressure falls
below that in atria so AV valves open.
- AV vales OPEN when pressure in Atria HIGHER than Ventricle
- AV valves CLOSE when pressure in Atria LOWER than Ventricle
- AV valves CLOSE when pressure in Atria LOWER than Ventricle
- SL valves OPEN when pressure in Ventricle HIGHER than Aorta
- SL valves CLOSE when pressure in Ventricle LOWER than Aorta
- SL valves CLOSE when pressure in Ventricle LOWER than Aorta
- 3. Both ventricles and atria relax. Higher pressure in
Aorta (than ventricle) close SL valves (stops back flow). Atria fill again
due to high pressure in Vena Cava. Increases
pressure in atria. Ventricles relax so pressure falls
below that in atria so AV valves open.
- 2. Atria now relax. Ventricles contract (decreasing
volume and increasing pressure). Pressure is
higher in ventricles than atria so AV valves shut
(stops back flow). Pressure in ventricles higher
than Aorta so SL valves open
- 1. When ventricle relaxes, the atria
contracts-decreasing volume and increasing
pressure. This pushes blood into the ventricles.
AV valve opens and SL valves close.
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