Smallest cell: Mycoplasma gallisepticum, (MG) is a bacterium belonging to the class of Mollicutes and the family Mycoplasmataceae. It is the causative agent of chronic respiratory disease (CRD) in chickens.
Longest cell: The longest cells in the human body are neurons. Neurons are cells within the nervous system and carry messages throughout the body.
Largest cell: The largest cell is an ostrich egg, it is about 15cm to 18 cm long and wide.