What it means
One of the two main proteins in muscle. Thin actin threads and thick myosin threads slide past each other when a muscle contracts; calcium and ATPay-tee-PEE (said as letters)Adenosine triphosphate: the molecule that stores and delivers energy for nearly every process in a cell.Full entry (the cell's energy) are needed for this. Actin also forms part of the inner frame of most other cells, which helps them keep their shape and move.
Related terms
skeletal muscle
Muscle attached to bones that a person moves by choice, such as the muscles of the arms and legs.
ATP
Adenosine triphosphate: the molecule that stores and delivers energy for nearly every process in a cell.