MUSCLE PHYSIOLOGY

Detailed explanation-1: -Cardiac muscle cells are located in the walls of the heart, appear striped (striated), and are under involuntary control. Smooth muscle fibers are located in walls of hollow visceral organs (such as the liver, pancreas, and intestines), except the heart, appear spindle-shaped, and are also under involuntary control.

Detailed explanation-2: -Cardiac muscle cells (cardiomyocytes) are striated, branched, contain many mitochondria, and are under involuntary control. Each myocyte contains a single, centrally located nucleus and is surrounded by a cell membrane known as the sarcolemma.

Detailed explanation-3: -Cardiac muscle is an involuntary striated muscle tissue found only in the heart and is responsible for the ability of the heart to pump blood.

Detailed explanation-4: -Cardiac muscle is characterized as striated muscle because microscopically, it presents a striated appearance essentially identical to that of skeletal muscle; it also shares with skeletal muscle many similar ultrastructural features.

Detailed explanation-5: -[1] Cardiomyocytes are striated, uninucleate muscle cells found exclusively in the heart muscle.