Cardiac muscle cells are . almost totally dependent on anaerobic metabolism mechanically, chemically, and electrically connected to one another multinucleated, with a low demand for nutrients nonstriated in appearance

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems