AIIMS 2007
- Exam
- AIIMS
- Year
- 2007
- Subject
- Zoology
- Chapter
- Chemical Coordination and Integration
AIIMS 2007 · Zoology · Chemical Coordination and Integration
Assertion : Aldosterone is a steroid hormone and is important in...
Assertion : Aldosterone is a steroid hormone and is important in the control of sodium and potassium ion concentration in mammals.
Reason : It upgrades sodium ion concentration in the ECF by promoting reabsorption of sodium ions from renal tubules and excretion of potassium ions in urine.
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
A. If both assertion and reason are true and reason is the correct explanation of assertion
Step-by-step solution
Aldosterone is a steroid hormone (mineralocorticoid) produced by the outer-section (zona glomerulosa) of the adrenal cortex in the adrenal gland to regulate sodium and potassium balance in the blood. Aldosterone hormone is produced in the cortex of adrenal gland (above the kidneys). This hormone affects body's ability to regulate blood pressure. It sends signals to the organs like kidney and colon, that can increase the amount of sodium that the body sends into the blood stream or the amount of potassium released in the urine. It also helps to maintain body's (\mathrm{pH}) and electrolyte levels.