The Band Test. The back and front of your bra band should be level and parallel to the floor when you look at yourself from the side in a mirror. If the band is too tight, digs into your flesh or is just plain uncomfortable, it's too small.
Scanning electron micrograph of a phagocyte (yellow: neutrophil) engulfing some bacteria (orange: anthrax bacilli). Phagocytes are the white blood cells that protect the body by eating (phagocytosing) dirt, bacteria and dead or dying cells. They are important for fighting infections.
A: The function of a choanocyte is to create water flow through the body of a sponge. This allows nutrients to filter through and feed the sponge. Choanocytes are cells located on the whip-like appendages, called flagella, located in the sponge, reads Reference.com.