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| Questão | Responda |
| Why do multicellular organisms need a constant, rapid supply of glucose and oxygen? | Multicellular organisms have a low SA:V ratio and a higher metabolic rate; many are very active This means a large number of cells are respiring very quickly CO₂ also needs to be removed from cells quickly |
| What are the different types of circulatory systems? | Single Double Closed Open |
| What is a single circulatory system? | Blood only passes through the heart once for each complete circuit of the body |
| Give an example of an organism with a single circulatory system | Fish - the heart pumps blood to the gills (to pick up oxygen) and then to the rest of the body |
| What is a double circulatory system? | Blood passes through the heart twice |
| Give an example of an organism with a double circulatory system | Mammals - right side pumps to the lungs, the left side pumps to the rest of the body. This makes the blood travel faster, so O₂ is delivered to tissues more quickly |
| What is a closed circulatory system? | The heart pumps blood into arteries which branch out into capillaries where O₂ and C₆H₁₂O₆ diffuse into body cells |
| TRUE OR FALSE: All vertebrates have a closed circulatory system where blood is enclosed inside blood vessels | TRUE |
| What is an open circulatory system? | Blood is not enclosed in blood vessels all the time; it flows freely through the body cavity. It does NOT supply the cells with O₂ - this is done by the tracheal system |
| TRUE OR FALSE: All invertebrates have an open circulatory system | FALSE Only some do (e.g. insects) |
| Complete the sentence: An insect's heart is ___________; it contracts in a ________, pumping blood into the main artery (which opens up into the ______ ________) | An insect's heart is SEGMENTED; it contracts in a WAVE, pumping blood into the main artery (which opens up into the BODY CAVITY) |
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