Urine formation involves:
a. glomerular filtration.
b. tubular secretion.
c. tubular reabsorption.
d. all of the above.

( D ) All of the above .

Explanation:

Urine Formation -

Kidney contains nephrons , whoes main function is excrete out unwanted substance from body , in the form of urine.

Urine formation involves three major process i.e. , Glomerular filtration , Tubular reabsorption and Tubular secretion.

Glomerular filtration -

It is the filtration process in which  blood is filtered and the nitrogenous waste and water moves inside the glomerulus.

Tubular reabsorption -

In this process, the molecules and ions gets reabsorbed into the circulatory system.

Tubular secretion -

The secretion process in which , substances like hydrogen ions , creatinine and drugs are removed from the blood and collected in the duct.

And the end product of this is the Urine.

to take away from

explanation:

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