Table of Contents
- 1 What do the collecting ducts of the kidney do?
- 2 How the kidney is able to reduce the water content of urine produced on a hot day?
- 3 How does antidiuretic hormone affect the permeability of the collecting ducts to water?
- 4 Where do the collecting ducts of the renal tubules drain?
- 5 How does the pituitary gland and kidneys reduce water loss?
- 6 How does the kidney regulate acid base balance?
- 7 How do the kidneys get rid of excess water?
- 8 What happens If ADH is not present in collecting ducts?
What do the collecting ducts of the kidney do?
The last part of a long, twisting tube that collects urine from the nephrons (cellular structures in the kidney that filter blood and form urine) and moves it into the renal pelvis and ureters.
How does the collecting duct reabsorb water?
The ability of the cortical collecting duct to absorb water is controlled by antidiuretic hormone (ADH). In the presence of ADH, AQP2-containing vesicles fuse with the apical membrane allowing water to enter the cell. Water exits from the basolateral aspect via AQP3 and AQP4 channels.
How the kidney is able to reduce the water content of urine produced on a hot day?
For instance, water is lost by the body in hot weather in sweat. This triggers the release of ADH into the blood which acts on the cells of the distal tubule and collecting duct to increase water resorption thus reducing the amount excreted.
How the kidneys regulate water balance in the body?
The blood is filtered at a high pressure and the kidney selectively reabsorbs any useful materials such as glucose, salt ions and water. After it has been purified, the blood returns to the circulatory system through the renal vein. The kidneys produce urine and this helps maintain water balance.
How does antidiuretic hormone affect the permeability of the collecting ducts to water?
In the absense of antidiuretic hormone, the collecting ducts are virtually impermiable to water, and it flows out as urine. Antidiuretic hormone stimulates water reabsorbtion by stimulating insertion of “water channels” or aquaporins into the membranes of kidney tubules.
What is the function of collecting duct Class 10?
Collecting duct collects urine and transports it to pelvis through ureters where it is temporarily stored in the urinary bladder.
Where do the collecting ducts of the renal tubules drain?
Nephrons begin in the cortex; the tubules dip down to the medulla, then return to the cortex before draining into the collecting duct. The collecting ducts then descend towards the renal pelvis and empty urine into the ureter.
Where is the collecting duct located in the kidney?
medulla
The glomerulus and convoluted tubules of the nephron are located in the cortex of the kidney, while the collecting ducts are located in the pyramids of the kidney’s medulla.
How does the pituitary gland and kidneys reduce water loss?
When the body is low in water, the pituitary gland secretes vasopressin (also called antidiuretic hormone) into the bloodstream. Vasopressin stimulates the kidneys to conserve water and excrete less urine.
What is the effect of antidiuretic hormone on the cells of the collecting duct?
Antidiuretic hormone binds to receptors on cells in the collecting ducts of the kidney and promotes reabsorption of water back into the circulation. In the absense of antidiuretic hormone, the collecting ducts are virtually impermiable to water, and it flows out as urine.
How does the kidney regulate acid base balance?
The kidneys play a major role in the regulation of acid-base balance by reabsorbing bicarbonate filtered by the glomeruli and excreting titratable acids and ammonia into the urine.
How are the collecting ducts affected by the hormone ADH?
How do the kidneys get rid of excess water?
Either the kidneys can conserve water by producing urine that is concentrated relative to plasma, or they can rid the body of excess water by producing urine that is dilute relative to plasma. Direct control of water excretion in the kidneys is exercised by vasopressin, or anti-diuretic hormone (ADH), a peptide hormone secreted by the hypothalamus.
How do the kidneys control the volume of bodily fluids?
One way the the kidneys can directly control the volume of bodily fluids is by the amount of water excreted in the urine. Either the kidneys can conserve water by producing urine that is concentrated relative to plasma, or they can rid the body of excess water by producing urine that is dilute relative to plasma.
What happens If ADH is not present in collecting ducts?
ADH causes the insertion of water channels into the membranes of cells lining the collecting ducts, allowing water reabsorption to occur. Without ADH, little water is reabsorbed in the collecting ducts and dilute urine is excreted.
How much water is lost from the body through the renal system?
Water loss from the body occurs predominantly through the renal system. A person produces an average of 1.5 liters (1.6 quarts) of urine per day. Although the volume of urine varies in response to hydration levels, there is a minimum volume of urine production required for proper bodily functions.