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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
Explain the autoregulatory mechanism of GFR.
Add a noteon composition of urine.
Fill in the blank.
When air is humid, the rate of transpiration is ..................
Differentiate between
bowman’s capsule and glomerulus.
One of the following sets of body parts or substances or processed, pick out the one item which overall includes the remaining foir.
ADH, Water, pituitary, osmoregulation, urine
Define the following term:
Ultrafiltration
Name the following:
Organ where ultrafiltration occurs.
Choose the correct option.
Tubular secretion does not take place in ______.
What forces promote glomerular filtration? What forces opposes them? What is meant by net filtration pressure?
What solute is normally present in the body to estimate GFR in humans?
Aldosterone acts at the distal convoluted tubule and collecting duct resulting in the absorption of water through ______.
Identfiy the biological term
Temporary storage of urine.
With regards to toxicity and the need for dilution in water, how different are ureotelic and uricotelic excretions? Give examples of animals that use these types of excretion?
How is urea formed in the human body?
During ultra:filtration, ____________ is unable to filter through the glomerular capillaries.
Na+ excretion in the urine is reduced by secretion of ______
Which part of the nephron allows the selective reabsorption of useful substances like glucose, amino acids, salts and water into the blood capillaries?
Complete the following:
Urinary excretion = Tubular reabsorption + Tubular secretion –
A large quantity of fluid is filtered every day by the nephrons in the kidneys. Only about 1% of it is excreted as urine. The remaining 99% of the filtrate ______.
