Question

Which urine concentration would contain the least amount of salt?

Select one:

a. 100mOsm

b. 300mOsm

c. 600mOsm

d. 1200mOsm

e. 1500mOsm

Answer 1

The answer to this question is option A, lower is the value lower is the salt concentration in urine which means low salt concentration in urine.

The osmolality of urine measures the concentration of urine in which higher values mean that the urine is concentrated or has high osmolarity and lower values indicate diluted urine and has lower osmolarity. Water intake (including water found in food) affects urine osmolality. Osmolality is calculated by an osmometer, which measures a solution's freezing point depression and produces results in terms of milliosmoles per kilogram of water. Urinary osmolality should be greater than 800 mOsm / kg in stable humans with minimal fluid intake, whereas a 24-hour urine osmolality would range between 500 and 800 mOsm / kg.
Urine osmolality in humans can range from about 50 to 1200 mOsm / kg, it depends on the person's routine either he/she has recently consumed a large amount of water (the lower number) or didn't consume without water or less water for a long time (the higher number.)

Antidiuretic hormone (ADH) main the salt concentration in the human body. In the case of diuresis where body starts losing a lot amount of water from the body ADH is released by the posterior pituitary which gives negative feedback and starts retaining salts and prevents its leakage from the body thus maintaining the osmolarity concentration in the body and helps the body from Hyponatremia.

Increased ADH - more water is reabsorbed- more concentrated urine - higher the osmolarity of urine

Deceased ADH- less water is reabsorbed-less concentrated urine- lower the osmolarity of urine