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.
Main content. Syphilis is a sexually transmitted infection (STI) caused by the bacterium Treponema pallidum. It has often been called the great imitator because so many of the signs and symptoms are indistinguishable from those of other diseases. How Is It Spread? Symptoms; Prevention; Treatment; Link Between Syphilis & HIV/AIDS; How Is It Spread?