Post Video Test - Excretory Products and their EliminationContact Number: 9667591930 / 8527521718Post Video Test - Excretory Products and their EliminationContact Number: 9667591930 / 8527521718A result of secretion of ADH is that :
1. the walls of the collecting ducts become less permeable to urea and water
2. the water channels, or aquaporins, appear in the cell membranes of the collecting duct epithelial cells promoting the reabsorption of water from the filtrate
3. the ultrafiltrate flowing through the collecting duct becomes more hypotonic
4. a greater volume of dilute urine is excreted
Identify the incorrect statement regarding antidiuretic hormone (ADH):
| 1. | It is synthesized by the neurons of the hypothalamus and stored and released from the neurohypophysis. |
| 2. | It binds to receptors on the collecting duct cells and activates a cAMP second messenger system. |
| 3. | It is released during body dehydration conditions and acts on the collecting duct. |
| 4. | ADH is released when osmoreceptors in the hypothalamus sense a decrease in the blood osmolality. |
Diabetes insipidus:
1. is due to increased secretion or action of ADH
2. is the result of decreased insulin secretion by the pancreas
3. is characterized by polydipsia and glycosuria
4. results in the production of a large volume of dilute urine
The urine concentrating ability of mammals and birds is correlated with the length of their:
| 1. | ureters | 2. | proximal convoluted tubules |
| 3. | distal convoluted tubules | 4. | loops of Henle |
The part of the nephron that is least permeable to water is the:
| 1. ascending limb of the loop of Henle | 2. descending limb of the loop of Henle |
| 3. collecting duct | 4. proximal convoluted tubule |
The region of human kidney where you expect to find maximum osmolarity is:
1. at the top of the renal cortex
2. at the bottom of the renal cortex
3. at the top of the renal medulla
4. at the bottom of the renal medulla
During the concentration of urine, the medullary interstitial osmolality is increased by all the following except:
1. Solute reabsorption in the ascending limb of the loop of Henle
2. Sodium reabsorption in the distal tubule
3. Urea reabsorption from the proximal tubule
4. Urea recycling between the loop of Henle and the collecting duct
The collecting ducts become permeable to water and urea due to:
| 1. Aldosterone | 2. Atrial natriuretic peptide |
| 3. Renin | 4. ADH (vasopressin) |
Identify the correct statement regarding human kidney function if ADH is not secreted in the body:
1. Urine will be isoosmotic with plasma.
2. PCT will not be able to reabsorb water and sodium.
3. The collecting ducts have very low permeability to water.
4. The distal tubules secrete water.
An increased production of dilute urine will be the result of:
1. decreased ADH secretion
2. increased renin secretion
3. increased insulin production
4. increased aldosterone secretion