Main Function of the Muscular System
- The main function of the muscular system is movement.
- There are three types of muscle tissue: skeletal, cardiac, and smooth.
- Skeletal muscle is voluntary.
- These muscles are attached to bones and are responsible for their movement.
- Skeletal muscle consists of long fibers and is striated due to the repeating patterns of the myofilaments (made of the protein actin and myosin) that make up the fibers.
- Cardiac muscle is found in the heart.
- Cardiac muscle is striated like skeletal muscle, but differs in that the plasma membrane of the cardiac muscle causes the muscle to beat even when away from the heart.
- The action potentials of cardiac and skeletal muscles also differ.
- Smooth muscle is involuntary.
- It is found in organs and enables functions such as digestion and respiration.
- Unlike skeletal and cardiac muscle, smooth muscle is not striated.
- Smooth muscle has less myosin and does not generate as much tension as skeletal muscle.