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.
Syphilis is a sexually transmitted disease caused by Treponema pallidum, a spiral-shaped bacterium, or spirochete. Congenital syphilis is rare. The bacterium usually enters the body through broken skin or through the membranes of the mouth, genitalia, or rectum during sexual contact.