Contraction of a Muscle
Module Four Lesson One Practice By: Brielle Winner
Myosin is a thick filament of protein found in skeletal muscle cells that will bind to, and pull on actin filaments during contraction. It needs two chemicals in order to attach to actin. They are ATP and tropomyosin.
ATP (adenosine triphosphate) is the main energy source for cell functions. When ATP is produced, calcium can be actively pumped in the body making muscle contractions.