Biology B3.2
- Created by: Will Pound
- Created on: 03-03-14 20:29
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- Biology B3.2
- The circulatory system and the heart
- The Heart!!!!
- The double circulation system in humans consists of blood vessels, bloods and the heart
- Blood flows in one direction
- Valves prevent backflow of blood
- The right pump forces deoxygenated blood from the lungs where it picks up oxygen and loses carbon dioxide
- After returning to the heart, the oxygenated blood is then pumped to the rest of the body by the left pump
- Keeping the blood flowing
- Arteries, veins and capillaries are the main types of blood vessels
- Substances diffuse between the blood and the cells in the capillaries
- Blocked or narrow arteries can be widened by stents
- Damaged heart valves can be replaced
- Transport in the blood
- Blood plasma transports dissolved food molecules carbon dioxide & urea
- Plasma also contains blood cells
- Red blood cells carry oxygen from the lungs to the cells
- White blood cells are part of the defence system
- Platelets are involved in blood clotting
- Artificial or real?
- There are advantages and disadvantages when using artificial blood or artificial hearts
- +
- Does not need to be refridgerated
- Do not need to match the persons tissue
- -
- Expensive
- Doesn't carry as much oxygen
- Unpleasant side-effects
- Lack of heart donors
- +
- Artificial's are useful when real blood or donor hearts are not available
- There are advantages and disadvantages when using artificial blood or artificial hearts
- Transport systems in plants
- Flowering plants have two transport tissues
- Xylem transports water and mineral ions from the roots to the stems and leaves
- Phloem transports food, such as dissolved sugar, from the leaves to other parts of the plant
- The circulatory system and the heart
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