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excretion
| Question | Answer |
|---|---|
| define excretion | removal of waste products of metabolism from the body |
| organs of excretion | kidney, lungs, skin |
| major functions of the kidney | excretion of urea, excess salts and water. osmoregulation-the maintenance of water balance and salt balance in body fluids |
| name the parts of a section of the kidney | cortex, pelvis, medulla, renal artery, renal vein, ureter |
| where does the remainder of the filtrate now called urine go | passes into pelvis of kidney and to the bladder for storage. |
| filtration of blood | blood enters glomerulus under high pressure. part of the blood is forced into the lumen of Bowmans capsule forming the glomerular filtrate. glomerular filtrate consists of H2O, glucose, amino acids, salts, urea, uric acid. |
| selective reabsorption | -proximal convoluted tubule: all glucose and amino acids and a lot of NaCl by active transport / large % of H2O by osmosis. -loop of Henle: H2O by osmosis -distal tubule: H2O by osmosis, controlled by ADH -collecting duct: " " |
| what is selective reabsorption | substances taken from the filtrate back into blood |
| what does ADH stand for | anti-diuretic hormone |
| secretion of ADH...... | by the pituitary gland depends on the concentration of the blood |
| what happens if blood concentration increases | secretion of ADH increases, walls of distal tubule and collecting duct become more permeable tonH2O, more H2O is reabsorbed here, blood concentration returns to normal. a small volume of concentrated urine is produced. |
Created by:
caoimhefraher
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