Excretory Products and Their Elimination
Every cell makes waste, and the body must get rid of it without losing the water and the salts that it needs. In this chapter you meet the three ways animals remove nitrogen, open up a kidney, and follow the filtrate along the nephron until it becomes urine. You see how the medulla makes urine more concentrated, and how hormones keep the kidney in step with the body. Then you learn about the bladder, the other organs that excrete, kidney stones, dialysis and transplant. Python counts the litres, the nitrogen and the clearance of urea.
Part of Biology · High School (11–12) (chapter 15)
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Nitrogenous Wastes and the Human Excretory System
Why a fish, a rabbit and a pigeon get rid of nitrogen in three different ways. Then the parts of the human excretory system, the layers of the kidney and the nephron, the unit that makes the urine, with its blood supply.
Urine Formation and the Control of the Kidney
How the kidney filters about 180 litres a day and keeps all but 1.5 litres. Filtration, reabsorption and secretion in each part of the nephron, the counter current that makes urine concentrated, and the hormones that tune the kidney: ADH, renin and angiotensin, aldosterone and ANF.