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.
Tricuspid regurgitation is also called tricuspid insufficiency or tricuspid incompetence. It means there is a backflow of blood from the lower-right chamber (the right ventricle) to the upper-right chamber (the right atrium), either because of a damaged tricuspid valve or an enlarged right ventricle.he tricuspid valve regulates the blood flow from the heart's upper-right chamber (the right atrium) to the lower-right chamber (the right ventricle). Two diseases of the tricuspid valve are regurgitation and stenosis. Tricuspid Regurgitation.