Comment upon the hormonal regulation of selective reabsorption.
Comment upon the hormonal regulation of selective reabsorption.
The functioning of the kidneys is efficiently monitored and regulated by Antidiuretic Hormone (ADH), Juxtaglomerular Apparatus (JGA) and Atrial Natriuretic Factor (ANF)
(a) Antidiuretic hormone (ADH) or vasopressin from the neurohypophysis, facilitates water reabsorption from the latter part of tubule i.e., distal convoluted tubule, and collecting duct by increasing the permeability to water and salt and by accelerating water and ion transfer in a direction determined by the osmotic gradient.
(b) Juxta Glomerular Apparatus (JGA) operates a multihormonal Renin Angiotensin Aldosterone System (RAAS) JG. cells secrete an enzyme, renin, which changes plasma protein called angiotensinogen to a peptide called angiotensin I and further to angiotensin II, which works as a hormone.
Angiotensin II, being a powerful vasoconstrictor increases the glomerular blood pressure and thereby GFR. Also stimulate's sodium absorption by proximal tubules.
(c) Angiotension II also activates the adrenal cortex to release aldosterone. Aldosterone includes the distal convoluted tubule to absorb more Na+ and water.
(d) Atrial Natriuretic factor (ANF) is produced by the atria of the heart. It regulates blood flow by causing vasodilation and increasing sodium excretion. it is also involved in checking of renin-angiotensin mechanism.
The functioning of the kidneys is efficiently monitored and regulated by Antidiuretic Hormone (ADH), Juxtaglomerular Apparatus (JGA) and Atrial Natriuretic Factor (ANF)
(a) Antidiuretic hormone (ADH) or vasopressin from the neurohypophysis, facilitates water reabsorption from the latter part of tubule i.e., distal convoluted tubule, and collecting duct by increasing the permeability to water and salt and by accelerating water and ion transfer in a direction determined by the osmotic gradient.
(b) Juxta Glomerular Apparatus (JGA) operates a multihormonal Renin Angiotensin Aldosterone System (RAAS) JG. cells secrete an enzyme, renin, which changes plasma protein called angiotensinogen to a peptide called angiotensin I and further to angiotensin II, which works as a hormone.
Angiotensin II, being a powerful vasoconstrictor increases the glomerular blood pressure and thereby GFR. Also stimulate's sodium absorption by proximal tubules.
(c) Angiotension II also activates the adrenal cortex to release aldosterone. Aldosterone includes the distal convoluted tubule to absorb more Na+ and water.
(d) Atrial Natriuretic factor (ANF) is produced by the atria of the heart. It regulates blood flow by causing vasodilation and increasing sodium excretion. it is also involved in checking of renin-angiotensin mechanism.
