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प्रश्न
What is tubular secretion? Name the substances secreted through the renal tubules.
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उत्तर १
Tubular secretion is the transfer of materials from peritubular capillaries to the renal tubular lumen; it is the opposite process of absorption. This secretion is caused mainly by active transport and passive diffusion. Renal secretion is different from reabsorption because it deals with filtering and cleaning substances from the blood, rather than retaining them.
The substances that are secreted into the tubular fluid for removal from the body include:
- Potassium ions (K+)
- Hydrogen ions (H+)
- Ammonium ions (NH4+)
- Creatinine
- Urea.
उत्तर २
The movement of substances such as H+, K+, NH4+, creatinine and organic acids from the peritubular capillaries into the tubular fluid, the filtrate is called Tubular secretion.
संबंधित प्रश्न
What is meant by the term osmoregulation?
Reabsorption of water from distal parts of the tubules is facilitated by hormone ______.
Add a noteon composition of urine.
Draw neat and labelled diagrams of Malpighian capsule
Put a tick mark (✓) against the most appropriate alternative in the following statement :
Besides water, the urine mainly contains :
Put a tick mark (✓) against the most appropriate alternative in the following statement :
Filtration of excretory wastes from the blood occurs in:
Fill in the blank :
The unit of human kidney is called .....................
Give the working of the nephron.
Give Reasons for the following:
As a result of ultrafiltration along with excretory products certain useful products like glucose, salt, etc. are also filtered but these are not excreted?
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Glomerular filtrate consists of many substances such as water, salts, glucose and white blood corpuscles.
Multiple Choice Question: Ultrafiltration occurs in:
Multiple Choice Question: In the Bowman’s capsule:
Mention any two vital functions of human kidney
In which segment of the nephron most of the re-absorption of substances takes place?
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.
The human kidney is histologically divided into ____________.
Which part of the nephron allows the selective reabsorption of useful substances like glucose, amino acids, salts and water into the blood capillaries?
What are the main processes of urine formation?
Complete the following:
Urinary excretion = Tubular reabsorption + Tubular secretion –
