help pls with homework!?

Question

Which of the following vitamins are excreted in the urine?
A. Vitamins A, C, and riboflavin
B. Vitamins A, E, and thiamin
C. Riboflavin, niacin, and vitamin C
D. Vitamins A, E, and K

Answer 1

Urine
An aqueous solution of organic and inorganic substances, mostly waste products of metabolism. The kidneys maintain the internal milieu of the body by excreting these waste products and adjusting the loss of water and electrolytes to keep the body fluids relatively constant in amount and composition. The urine normally is clear and has a specific gravity of 1.017–1.020, depending upon the amount of fluid ingested, perspiration, and diet. The increase in specific gravity above that of water is due to the presence of dissolved solids, about 60% of which are organic substances such as urea, uric acid, creatinine, and ammonia; and 40% of which are inorganic substances such as sodium, chloride, calcium, potassium, phosphates, and sulfates. Its reaction is usually acid (pH 6) but this too varies with the diet. It usually has a faint yellow color due to a urochrome pigment, but the color varies depending upon the degree of concentration, and the ingestion of certain foods (for example, rhubarb) or cathartics. It usually has a characteristic aromatic odor, the cause of which is not known.
==================

Urine is liquid produced by animals and humans alike through the kidney, and is collected in the bladder and excreted through the urethra which is a tube inside the male penis, or a tube opening in the vulva between the vaginal opening and clitoris. Urine is used to extract excess minerals or vitamins as well as corpuscles from the body. A range of other substances, including alcohol and artificial sweeteners, are also extracted through the bladder.


Composition
Healthy urine is a clear aqueous solution, varying in colour from dark yellow to colourless depending on the dilution. The main constituents of urine are water, salts and urea. Urochrome is the pigment that gives urine its color. Urea is one of the three nitrogenous waste products. The other two are creatinine and uric acid. Urine also contains various inorganic ions, including phosphate, sodium, and chloride. Lighter urine color usually indicates higher water consumption.

===================
http://www.answers.com/urine

http://www.answers.com/topic/urinalysis

Just Check this

Answer 2

d