176274
Description
Flashcards by fahimarehman04, updated more than 1 year ago
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Created by fahimarehman04
over 11 years ago
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| Question | Answer |
| What does the plasma carry? | Disolved food substances such as glucose, carbon dioxide from from the tissue to the lung, hormones from the glands to the target, waste substances such as urea. |
| How are red blood cells adapted to their function? | They are very small so that they can pass through the smallest blood vessels. They are shaped like biconcave discs so that they have a large surface area to exchange oxygen quicker. Contains haemoglobin to carry oxygen. They don't have nucleus so that more oxygen can fit in. |
| What is oxyheamoglobin? | Haemoglobin reacting with oxygen in the lungs. The reaction is reversible. |
| What is oxyheamoglobin? | Haemoglobin reacting with oxygen in the lungs. The reaction is reversible. |
| Name the different blood vessels and name their jobs: | -Arteries transport blood away from the heart to the tissues. -Veins transport the blood back to the heart from the tissues. -Capillaries link arteries to veins and allow materials to pass between the blood and tissues. |
| Explain how the structure of each blood vessel is adapted to its function: | -Arteries have a thick and elastic wall to resist the high pressure. -Veins have large lumen and valves to try and keep the blood moving back to the heart. -Capillaries have permeable walls so that substances can be transferred between the blood and tissue. |
| Explain how the different parts of the heart work together to circulate the blood: | -Left and right atria receive blood from veins. -Left hd right ventricles pump blood out into arteries. -Semilunar, tricuspid and bicuspid valves prevent back flow of blood. -Pulmonary veins and vena cava are the main veins carrying blood back to the heart. -Aorta and pulmonary arteries carry blood away from heart. |
| The left ventricle has a thicker wall than the right. Why? | It has to pump blood all around the body rather than just to the lungs. |
| What is a double circulatory system? | It is when blood is pumped to the lungs and returns to the heart to be pumped to the body. |
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