Muscular System

• Smooth muscles are involuntary muscles found in the walls of hollow organs like the stomach and intestines.
• Cardiac muscles are involuntary muscles found only in the heart.
• Skeletal muscles are attached to bones by tendons.
• The skeletal muscle system is the largest organ system in the body.
• Skeletal muscles are voluntary muscles attached to the bones that allow for movement.
• The skeleton provides support, protection, and attachment sites for muscles.
• Muscles have three layers: epimysium, perimysium, endomysium
• There are three types of muscles: smooth, cardiac, and skeletal.
• Perimysium - middle layer of connective tissue surrounding bundles or fascicles of muscle fibers
• Epimysium - outermost layer of connective tissue surrounding an entire muscle
• Endomysium - surrounds individual muscle cells (myofibrils) within fascicle