Cytoplasm. The cytoplasm is the part of the cell which does all the work. Different cells do different jobs, however whatever the job is it will require energy in the form of a chemical called ATP. This energy containing chemical is produced by tiny organelles in the cell called mitochondria. Muscle cells contain two very special chemicals called actin and myosin.
Definition of TREPHINATION. : an act or instance of perforating the skull with a surgical instrument. ADVERTISEMENT.efinition of TREPHINATION. : an act or instance of perforating the skull with a surgical instrument. ADVERTISEMENT.
Medical Definition of treponema. 1  1 capitalized : a genus of the family Spirochaetaceae comprising anaerobic spirochetes that are pathogenic in humans and other warm-blooded animals and include one (T. pallidum) causing syphilis and another (T. pertenue) causing yaws.