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What type of urine would be formed in the absence of ADH?
ADH normally causes the kidneys to make the urine more concentrated. As a result of not responding to the ADH signal, the kidneys release too much water into the urine. This causes the body to produce a large quantity of very dilute urine.
What happens in the absence of ADH?
Diabetes insipidus is caused by a lack of antidiuretic hormone (ADH), also called vasopressin, which prevents dehydration, or the kidney’s inability to respond to ADH. ADH enables the kidneys to retain water in the body. The hormone is produced in a region of the brain called the hypothalamus.
How is concentrated urine formed?
When water intake is large enough to dilute blood plasma, a urine more dilute than blood plasma is produced; when water intake is so small that blood plasma is concentrated, a urine more concentrated than blood plasma is produced.
What is meant by concentrated urine?
More concentrated urine means that there are more solutes and less water in the sample. Solutes are dissolved particles, such as sugars, salts, and proteins. Normal values may vary based on the laboratory used.
What is hypertonic urine?
Hypertonic solution is that solution in which water moves out by osmosis. So hypertonic urine is that urine in which water moves out from the urine. Since water moves out of the urine, so urine is concentrated and is called hypertonic urine.
How is urine produced Class 10 Ncert?
Urine is formed in three main steps- glomerular filtration, reabsorption and secretion. It comprises 95 % water and 5% wastes such as ions of sodium, potassium and calcium, and nitrogenous wastes such as creatinine, urea and ammonia.
Can urine concentration vary without ADH?
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.
Is urine hypertonic or hypotonic?
(b) The urine is hypotonic to the blood but hypertonic to the external medium and its concentration may differ in the two antennary glands.
Is urine hypotonic or hypertonic?
Where is primary urine formed?
excretory systems. Primary urine is formed by filtration from the blood. From this primary urine certain substances are reabsorbed into the blood and other substances are secreted into the primary urine from the blood.