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.
Pronation is a normal part of walking or running. When the outside edge of your heel hits the ground, it supinatesâor locksâto deal with the shockwave. Your foot then rolls in a bit and your heel moves outward. Together, these actions cause you to pronateâor unlock. Pronation helps you absorb shock and adapt to uneven surfaces.