Ventilation and gas exchange in the lungs

1. The control of water and salt levels in the body which prevents problems with osmois (14)
4. A measure of the total space occupied by the surface (7, 4)
5. The contril of water and salt levelsm in the body wgich prevents problems with omosis (14)
7. The movement of molecules agaisnt a concentration gradient, across a membrane (6, 9)
8. The movement of molecules down their concentration gradient, across a membrane, with the help of carrier proteins (11, 9)

2. A measure of the ability of water molecules to move freely in solution (5, 9)
3. A group of blood vessels that supply the nephrons in many excretory systems (8, 10)
6. The net movement of water molecules from an area of high water potential to an area of low water potential, down a water potential gradient and across a partially permeable membrane (6)

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