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Tour of the Human Body Systems

The Tour Starts Here!

The Immune System
The Nervous System
The Excretory System
The Respiratory System
The Circulatory Syatem
The Digestive System
The Skeletal System
The Muscular System
Glossary of Terms
The Muscular System Vocabulary

Acetylcholine: Chemical neurotransmitter in the brain and PNS.
Actin: Protein component of microfilaments; form thin filaments in skeletal muscles and produce contractions of all mucles through interaction with thick filaments.
Cholinesterase; Enzyme breaks down and inactivates ACh.
Cardiac muscle: Muscle that never gets tired. It is found in the heart.
Extensor: Pushes away from the body.
Fatigue: When the muscle gets tired because it rans out of oxygen.
Flexor: Pushes toward the body.
Ligament: Dense band of connective tissue fibers that attach one bone to another.
Muscle fiber: Tiny fibers of muscle that bunch together and contract.
Myofibril: Organized collections of myofilaments in skeletal and cardiac muscle cells.
Myosin: Protein component of the thick myofilaments.
Skeletal Muscle: A contractile organ of the muscular system.
Smooth muscle: Muscle tissue found in the walls of many visceral organs; charactized as nonstriated, involuntary muscle.
Tendon: A collagenous band that connects a skeletal muscle to an element of the skeleton.