Mass transport

1. What are next to sieve tube elements? (9, 5)
4. In respire tissue the concentration of carbon dioxide is high. Affinity of haemoglobin for oxygen is reduced which means that oxygen is readily unloaded into muscle cells. Will the oxygen dissociation curve move to the left or right (5)
5. Where is energy for transpiration supplied from? (3, 3)
6. When ventricle walls are relaxed this causes them to recoil and does what to the pressure in the ventricle? (7, 2)
10. Blood is kept flowing in one direction through the heart & around the body by the pressure created by what? (3, 5, 6)

2. Each polypeptide is associated with a .... group? (4, 5)
3. What is phloem made up of? (5, 4, 8)
5. Where does unloading take place in a human? (7)
8. In some circumstances there might be blood flowing backwards due to pressure difference. What structure is in place to prevent this? (6)
9. The more active a tissue the more what will be unloaded? (6)

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