Question

Human urine is usually acidic because
A) The sodium transporter exchanges one hydrogen ion for each sodium ion, in peritubular capillaries
B) Excreted plasma proteins are acidic
C) Potassium and sodium exchange generates acidity
D) Hydrogen ions are actively secreted into the filtrate

Answer 1

Hint: Soluble waste is mainly excreted by the digestive system of humans and, to a lesser degree of terms of urea, eliminated by transpiration. The kidneys, urinary bladder, ureters, or urethra comprise a urinary system.

Complete Answer:
Urine in humans and in most other organisms is a fluid by-product of digestion. Urine flows to the urinary bladder from the kidneys into the ureters. Urination contributes to the excretion of urine from the body via the urethra.

Now, let us find the solution from the options-
- Urine includes a mixture of organic compounds and inorganic salts that differ by what is incorporated into the body, including hormones, proteins, and a broad range of metabolites. Thus, option A is not the correct option.
- With an average of 6.2, the pH is usually within the 5.5 to 7 range. In persons having hyperuricosuria, acidic urine may lead to the forming of stones of uric acid in the ureters, kidneys, or bladder. Thus, option B is not the correct option.
- A diet rich in diary and meat proteins as well as alcohol intake can decrease the pH of the urine, while potassium and organic acids can increase the pH and make it more alkaline, including from diets rich in vegetables and fruit. Thus option C is not the correct option.
- On average, an adult person excretes 1 to 1.5 liters of urine a day. The urine produced is a watery fluid with a light yellow colour that is strongly acidic (pH-6.0). Human urine is typically acidic since the filtrate is constantly secreted by hydrogen ions.

Thus, the correct answer is option (D) Hydrogen ions are actively secreted into the filtrate.

Note: The kidneys, as well as surplus water, sugars, and a number of other chemicals, remove soluble waste from the bloodstream. High amounts of urea and other chemicals, including toxins, comprise the resultant urine. Before going out of the body, urine passes from the kidney into the ureter, bladder and eventually a urethra.