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प्रश्न
What is meant by the term osmoregulation?
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उत्तर
- Kidneys continuously remove harmful substances from the body in the form of urine. Apart from this, the tissues also control the amount of salt and water in the liquid.
- When the amount of water in the body increases, that is, when the osmolality of the body fluid decreases, urine becomes thin (diluted) and its quantity increases.
- When there is a lack of water in the body, that is, when the osmolality of body tissue fluid increases, urine becomes thicker and its quantity reduces.
- The amount of urine is mainly controlled by aldosterone and antidiuretics. Aldosterone increases the reabsorption of Na+, so that the appropriate amount of Na+ is maintained in the environment.
- Antidiuretic or vasopressin, is the main regulator of urine dilution or concentration. Osmolality is controlled in the bodies of living beings through the process of osmotic regulation.
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संबंधित प्रश्न
Define the Glomerular Filtration Rate (GFR).
Put a tick mark (✓) against the most appropriate alternative in the following statement :
Besides water, the urine mainly contains :
Define the following:
Dialysis
Write True (T) or False (F) for the following statement. Rewrite the false statement in the correct form.
Medulla of kidney passes urine into urinary bladder.
State if the following statement is true or false. Correct the statement if it is false.
The Bowman’s capsule and glomerulus together form the Malpighian body.
Differentiate between
bowman’s capsule and glomerulus.
Write down the functional activity of the following parts,
Urethra ……………………
What forces promote glomerular filtration? What forces opposes them? What is meant by net filtration pressure?
When a molecule or ion is reabsorbed from the lumen of the nephron, where does it go? If a solute is filtered and not reabsorbed from the tubule, where does it go?
Concentration of urine depends upon which part of the nephron
Aldosterone acts at the distal convoluted tubule and collecting duct resulting in the absorption of water through ______.
The osmotic pressure of blood that opposes ultrafiltration is about ______ mm Hg.
Which part of the nephron allows the selective reabsorption of useful substances like glucose, amino acids, salts and water into the blood capillaries?
Filtration of the blood takes place at ______.
First step in urine formation is ______.
Minimum reabsorption occurs in ______.
Complete the following:
Urinary excretion = Tubular reabsorption + Tubular secretion –
The composition of glomerular filtrate and urine is not same. Comment.
How does tubular secretion help in maintaining ionic and acid-base balance in body fluids?
Write full form of the following abbreviation:
DCT
