Transport Systems
- Created by: Nicola Carter
- Created on: 29-12-12 14:31
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- Transport Systems
- Large animals transport systems
- Size - larger animals cannot gain oxygen and nutrients by diffusion alone need transport systems
- Surface area to volume ratio - large animals have a small SA:V ratio
- Level of Activity - the more active an animal the oxygen and nutrients it needs
- Features of a good transport system
- A fluid of medium to carry nutrients and oxygen around the body (blood)
- A pump to create pressure that will push the fluid around the body (heart)
- Exchange surfaces that enable oxygen and nutrients to enter the blood and to leave it again where they are needed
- Tubes or vessels to carry the blood
- Two circuits - one to pick up oxygen and another to deliver oxygen to the tissues
- Single and double circulatory systems
- Single circulatory - blood flows in a continuous loop doesn't go to the same place twice in one circuit (Fish have)
- Double circulatory - two different 'loops' (Mammals have)
- One loop carries blood tot he lungs to pick up oxygen (Pulmonary circulation)
- Other loop carries the oxygen and nutrients around the body to the tissues (Systemic Circulation)
- Large animals transport systems
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