Given below are two statements.

Statement I - Defecation is an involuntary process that takes place through anal opening guarded by sphincter muscles.

Statement II - Distension, of rectum stimulates pressure sensitive receptors that initiate a neural reflex for egestion.

In light of above statements, select the correct answer from the option given below.

People who consume high protein diet can develop __________ stones.

An organ with sphincters at its origin is

Tubular fluid tends to become acidic in the_________ of nephron.