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प्रश्न
Which segment is the site of secretion and regulated reabsorption of ions and pH homeostasis?
उत्तर
- Distal tubule
- Collecting duct
- In the renal tubules H+ and NH4 are secreted and liberated into the tubules and excreted through
urine thus maintaining acid-base balance. - For each H+ ions from the liberated filtrate one Na+ is reabsorbed in the tubules.
- The secreted HCO3, PO3 and NH3 combines to form carbonic acid and phosphoric acids.
- Thus the H+ are maintained and their reabsorption is prevented.
संबंधित प्रश्न
Glucose is taken back from glomerular filtrate ___________
(A) along with concentration gradient
(B) against concentration gradient
(C) by simple diffusion
(D) by tubular secretion
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.
What is meant by osmoregulation?
Define the following term:
Ultrafiltration
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:
Sometimes urine may contain certain excess vitamins.
Higher Order Thinking Skill
Why do you think that urine analysis is an important part of medical diagnosis?
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?
Glomerular filtrate contains ______.
Identify the biological term
A liquid which gathers in the bladder.
Identify the biological term
Each contains a glomerulus.
Identify the biological term
Regulation of water and dissolved substances in blood and tissue fluid.
What is the nitrogenous waste produced by amphibian larvae and by the adult animal?
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 –
How does tubular secretion help in maintaining ionic and acid-base balance in body fluids?
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 ______.
Name the following:
Three stages of urine formation.
