Ventilation and gas exchange in the lungs

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• 2. 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)
• 3. A measure of the ability of water molecules to move freely in solution (5, 9)
• 4. A measure of the total space occupied by the surface (7, 4)
• 5. The movement of molecules agaisnt a concentration gradient, across a membrane (6, 9)
• 6. The control of water and salt levels in the body which prevents problems with osmois (14)
• 7. A group of blood vessels that supply the nephrons in many excretory systems (8, 10)
• 8. The contril of water and salt levelsm in the body wgich prevents problems with omosis (14)