Does the food that cats eat contain very small grains of sand that can enter the bladder?

There is fine sand in cat food, which will not enter the bladder. Will be excreted through feces.

Sand can't be decomposed and absorbed by cats, but can only stay in the intestines and be discharged with food residues. Urine is stored in the bladder, which is a liquid product of body metabolism and contains urea. After blood metabolism, it flows into the bladder, so sand will not be absorbed, naturally it will not enter the blood, so it is impossible to enter the bladder.