B3: Heart, lungs and kidneys
Some info on each these key parts of B3 :)
- Created by: khastie
- Created on: 12-05-14 17:08
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- B3 Heart, lungs, kidneys
- Ventilating the lungs
- Positive pressure
- air is forced through trachea into lungs
- E.G. breathing aids
- Are small, easier to manage and can be linked to computers
- Negative pressure
- Iron lung
- 1. Person has chest inside cylinder
- 2. Air is drawn out of the cyclinder
- 3. When air is drawn out, person breathes in
- 4. When air is pumped back into the cylinder, the person is forced to breathe out
- Iron lung
- Positive pressure
- Kidney
- Urea is filtered out of the blood, leaves body in urine
- Glucose is filtered out of the blood and then reabsorbed by active transport
- Glucose is needed for respiration
- Water is filtered out of the blood, whatever the body needs is reabsorbed by osmosis
- Salts/ mineral ions are removed and then whatever is required is reabsorbed by active transport
- Blood cells and proteins stay in blood- too large
- Indicator of kidney disease- protein or blood cells in urine
- Dialysis
- 1. Blood taken out of an artery in the arm
- 2. Blood thinners are added to avoid the blood clotting
- 3. Flows into a dialysis machine
- 4. Machine contains isotonic dialysis fluid
- 5. Works as a normal kidney, air is removed from blood and goes into body through a vein in arm
- The heart
- Double circulatory system
- Blood vessels
- Veins
- Large lumen
- Thin walls
- Valves to prevent back-flow of blood
- Thin muscular fibres
- Capillaries
- Walls a single cell thick
- Narrow lumen
- Flow through organs
- Arteries
- Take blood away from the heart
- Thick muscular fibres- flood at high pressure
- Thick walls
- Small lumen
- Veins
- Pulmonary vein- brings oxygenated blood from lungs to the heart
- Pulmonary artery- takes de-oxygenated blood to the lungs
- Aorta- takes oxygenated blood to the body
- Vena cava- brings deoxygenated blood from the body and head to the heart
- Ventilating the lungs
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