AIIMS 2004
- Exam
- AIIMS
- Year
- 2004
- Subject
- Zoology
- Chapter
- Chemical Coordination and Integration
AIIMS 2004 · Zoology · Chemical Coordination and Integration
Assertion : Diabetes insipidus is marked by excessive urination and...
Assertion : Diabetes insipidus is marked by excessive urination and too much thirst of water.
Reason : Anti-diuretic hormone (ADH) is secreted by the posterior lobe of pituitary gland.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion
- BIf both assertion and reason are true but reason is not the correct explanation of assertion
- CIf assertion is true but reason is false
- DIf both assertion and reason are false.
Correct answer
B. If both assertion and reason are true but reason is not the correct explanation of assertion
Step-by-step solution
Antidiuretic hormone or vasopressin is secreted from posterior pituitary gland. It is released in response to a fall in the water content of blood plasma and leads to an increase in the permeability to water of the distal and collecting tubules of the nephron. Deficiency or hyposecretion of results in diabetes insipidus. Diabetes insipidus is characterised by micturating dilute urine several times a day which results in excessive thirst (polydipsia) and dehydration.