3.Each capillary cluster in the kidney is associated with the cup- shaped end of a tube that collects the filtered urine (see adjoining figure). Each kidney has large numbers of these filtration units called nephrons packed close together. Some substances in the initial filtrate, such as glucose, amino acids, salts and a major amount of water, are selectively re-absorbed as the urine flows along the tube. The amount of water reabsorbed depends on how much excess water there is in the body, and on how much of dissolved waste there is to be excreted. The urine forming ineach kidney eventually enters a long tube, the ureter, which connects the kidneys with the urinary bladder. Urine is stored in the urinary bladder until the pressure of the expanded bladder leads to the urge to pass it out through the urethra. The bladder is muscular, so it is undernervous control, as we have discussed elsewhere. As a result, we can usually control the urge to urinate.

3.Each capillary cluster in the kidney is associated with the cup- shaped end of a tube that collects the filtered urine (see adjoining figure). Each kidney has large numbers of these filtration units called nephrons packed close together. Some substances in the initial filtrate, such as glucose, amino acids, salts and a major amount of water, are selectively re-absorbed as the urine flows along the tube. The amount of water reabsorbed depends on how much excess water there is in the body, and on how much of dissolved waste there is to be excreted. The urine forming ineach kidney eventually enters a long tube, the ureter, which connects the kidneys with the urinary bladder. Urine is stored in the urinary bladder until the pressure of the expanded bladder leads to the urge to pass it out through the urethra. The bladder is muscular, so it is undernervous control, as we have discussed elsewhere. As a result, we can usually control the urge to urinate.

(iii)The kidneys in human beings
are a part of the system for
(a) nutrition. (b) respiration . (c)
excretion. (d) transportation

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Class 10 science swatiqna 3 years 2021-12-19T09:02:06+00:00 2021-12-19T09:02:06+00:00 1 Answer 72 views Enlightened 0