level: 7.3 Circulatory system of a mammal
Questions and Answers List
level questions: 7.3 Circulatory system of a mammal
| Question | Answer |
|---|---|
| Why large organisms have a transport system | - Have a low SA: volume ratio - So they need a specialised transport system to carry raw materials from specialised exchange organs to cells - circulatory system |
| Closed circulatory system | - Blood confined to vessels |
| The circulatory system | - Made up of heart + blood vessels - Heart pumps blood to blood vessels to reach different parts of body - Blood transports respiratory gases, products of digestion, metabolic wastes + hormones |
| Double circulatory system | - Mammals have a closed, double circulatory system - 2 circuits - One circuit takes blood from heart to lungs - One circuit takes blood around the rest of body |