How did ADH affect the urine volume? Why did the concentration of potassium change in the presence of ADH without a change in the excretion of potassium? … ADH favors formation of concentrated urine because ADH causes an increase of water permeability in the DCT and collecting ducts.
Why did the addition of ADH also affect the concentration of potassium in urine?
The addition of ADH affected the potassium concentration in urine because when water is removed, then the concentration of potassium is greater because the water is decreased.
What happened to the concentration of potassium in the urine in the presence of aldosterone?
WHEN ALDOSTERONE IS PRESENT, URINE VOLUME SLIGHTLY DECREASED AS THE INTERSTITIAL GRADIENT INCREASES. … URINE VOLUME IS ONE-TENTH OF VOLUME WITHOUT ADH. WITH ADH, POTASSIUM CONCENTRATION IS 10X THAT OF THE CONCENTRATION WITHOUT ADH. THERE IS NO INCREASE IN POTASSIUM SECRETION WITH ADH.
Does ADH favor the formation of concentrated urine?
How does ADH affect the urine volume? ADH favor the formation of concentrated urine. It causes an increase of water permeability in the Distal tubule and collecting ducts. Water moves from these tubules into the interstitial fluid by osmosis.
What happened to urine volume and concentration in the presence of ADH?
In the presence of ADH, the medullary collecting ducts become freely permeable to solute and water. As a consequence, the fluid entering the ducts (en route to the renal pelvis and subsequent elimination) acquires the concentration of the interstitial fluid of the medulla; i.e., the urine becomes concentrated.
How does ADH affect potassium?
Both of these are enhanced primarily by aldosterone, and also by ADH (by decreasing urine flow, ADH reduces K secretion, but by increasing luminal permeability, ADH promotes it) and by dietary K excess.
Why does glucose concentration become zero?
Why does the glucose concentration in the urinary bladder become zero in these experiments? The more glucose carriers, the more glucose absorbed. This plus the fact that the glucose amount in the concentrated capsule did not ever change led to the glucose concentration in the bladder becoming 0.
Does aldosterone increase urine concentration?
Aldosterone increases urine production and decreases apical AQP2 expression in rats with diabetes insipidus | American Journal of Physiology-Renal Physiology.
How do kidneys regulate potassium levels?
Regulation. The potassium content of the body is maintained through variation of renal excretion. Aldosterone increases the secretion of potassium from connecting segments and collecting ducts of the kidney by acting on the mineralocorticoid receptor (NR3C2) in those segments.
Can urine concentration vary without ADH?
ADH has the greater effect on urine volume. … The urine concentration will not vary in the absence of ADH. Consider this situation: you want to reabsorb sodium ions but you do not want to increase the volume of the blood by reabsorbing large amounts of water from the filtrate.
Which hormone aldosterone or ADH has a greater impact on urine concentration?
Antidiuretic hormone (ADH) has the greatest effect on urine volume as compared to aldosterone. ADH is responsible for fluid retention.
What is the role of ADH?
Anti-diuretic hormone helps to control blood pressure by acting on the kidneys and the blood vessels. Its most important role is to conserve the fluid volume of your body by reducing the amount of water passed out in the urine.
Why does ADH affect urine volume?
The principal determinant for the release of ADH from the posterior pituitary gland is an increase in the osmolarity of the body fluid will stimulate more release of ADH. … ADH has the greater effect on urine volume because it causes a higher decrease in the amount of volume.
How does ADH promote urine concentration?
Antidiuretic hormone stimulates water reabsorbtion by stimulating insertion of “water channels” or aquaporins into the membranes of kidney tubules. These channels transport solute-free water through tubular cells and back into blood, leading to a decrease in plasma osmolarity and an increase osmolarity of urine.
Which hormone is concerned with the concentration of urine?
The hypothalamus produces a polypeptide hormone known as antidiuretic hormone (ADH), which is transported to and released from the posterior pituitary gland. The principal action of ADH is to regulate the amount of water excreted by the kidneys.
Where does ADH have its greatest effect?
Answer and Explanation: ADH has its greatest effect in the C) distal convoluted tubule. Here, this hormone acts on aquaporin molecules to remove more water from the urine, promoting resorption, thus keeping fluid levels higher in the body.