wiz-icon
MyQuestionIcon
MyQuestionIcon
7
You visited us 7 times! Enjoying our articles? Unlock Full Access!
Question

Which of the following is the main activating factor of aldosterone secretion during periods of dehydration?


A

ACTH

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

Sympathetic nervous system

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

Renin

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D

Spontaneous adrenal release

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C

Renin


When renal blood flow is reduced, juxtaglomerular cells in the kidneys convert the precursor, in the blood, into renin and secrete it directly into the circulation. Plasma renin then converts angiotensinogen, released by the liver, into angiotensin I. Angiotensin I is then, converted to angiotensin II by the angiotensin-converting enzyme (ACE) found in the lungs. Angiotensin II also stimulates the secretion of the hormone aldosterone from the adrenal cortex. Aldosterone causes the renal tubules to increase the reabsorption of sodium and water into the blood, while at the same time causing the excretion of potassium (to maintain electrolyte balance). This increases the volume of extracellular fluid in the body, which also increases blood pressure.


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Hormones of Posterior Pituitary
BIOLOGY
Watch in App
Join BYJU'S Learning Program
CrossIcon