Muscle fibres contain two myofilaments called actin and myosin
fibers
muscle fiber
Muscles need ATP to contract. Mitochondria produce most of the ATP in the cell, so there are lots of mitochondria in muscle.
Most of the body's glycogen is stored in the liver and muscles. The liver stores glycogen for maintaining blood glucose levels, while muscles use glycogen as a source of energy during physical activity.
Most reptiles are carnivores ! Snakes eat mammals and rodents - Most lizards eat insects (which contain muscles - aka meat)
skeletal muscles
skeletal muscles
Tentacles need the most muscles.
Most leg muscles and arm muscles, some muscles in the head, and most internal muscles.
Of course.
the muscles of the abdomen
Most muscles used by the goalkeeper is their eyes and hands.