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Across 5. Arteriole that carries blood away from the Bowman's capsule. 8. Carries urine from the bladder to the outside of the body. 12. A hormone that not only controls the sodium ion concentration but also the potassium ion concentration in the body. 15. A substance that increases the amount of water being absorbed into the blood and so limiting the amount of water lost in urine. 16. Removal of undigested and unabsorbed food material from the gut 18. A steroid hormone produced by the adrenal cortex glands. 19. Ions that passively follow the path of sodium ions. 21. Main nitrogenous waste compound excreted, formed from breakdown of excess amino acids. 22. A hormone that is secreted by the hypothalamus but stored in the posterior pituitary gland. 23. Filtration through very fine filter under pressure.

Down 1. Made up of collecting ducts. 2. Vein that carries purified deoxygenated blood to the inferior vena cava. 3. Chemical substance that prevents too great a change in pH. 4. Arteriole that carries blood into the Bowman's capsule. 6. Tissue that helps to hold the kidney in place and cushions it against blows. 7. The number of solute particles dissolved in one liter of water. 9. Pressure that is built up forcing the filterable contents of the blood through the glomerular membrane. 10. Formed from creatine phosphate found in muscle cells. 11. Carries urine from pelvis to bladder. 13. A process that controls the water and the solute content in the body. 14. The type of energy that is needed for active transport to join the molecule to the carrier molecule. 17. A network of cappillaries the reabsorbs the water, glucose, amino acids, vitamins and salts that the body needs. 19. Short duct which collects urine from the collecting ducts. 20. Tip of each pyramid, fits into calyx.