SCIENCE 1.5

a complex system that integrates muscles and nerves

long bundles of axons that transmit signals from the central nervous system; they send and receive signals in the neuromuscular system

nerves that send messages to the Central nervous system

nerves that send messages out to the muscles

the nervous system that controls involuntary actions involving cardiac and smooth muscle, such as heart rhythm, digestion, and breathing

makes skeletal muscles do a deliberate action such as walking, throwing, or typing

contains long myofibrils made of sacomere units, each consisting of long strands of proteins called actin and myosin

a nerve fiber that carries a nerve impulse away from the neuron body cell

the process leading to shortening and or development of tension in a muscle

the structure that allows neurons to pass signals to other neurons, muscles or glands

the nervous system sends a signal to a muscle. Actin and myosin proteins in the muscle slide past each other creating either a contraction or relaxation of the muscle. Each muscle fiber is connected to a nerve fiber.