The Muscular System

Myosin

protein that makes up thick filaments in striations in skeletal muscle cells

Actin

a protein that mainly makes up the thin filaments in striations in skeletal muscles

ATP (Adenine Triphosphate)

supplies the energy for muscle contraction

Neuromuscular Junction

the point of contact between a motor neuron and a skeletal muscle cell

Acetylcholine

a neurotransmitter that initiates muscle contraction

Pectoralis Major

a thick, fan-shaped muscle, situated at the upper front of the chest wall, functioning to adduct and rotate the upper arm

Deltoid

muscle that forms the rounded contour of the shoulder and abducts the arm