Muscles

In this topic

• Muscles — the active part of movement
• The structure of a skeletal muscle
• The main groups of muscles
• How muscles work and why they tire

Key terms

• Skeletal muscle
• Smooth muscle
• Cardiac muscle
• Muscle fibre
• Fascia
• Myofibril
• Actin and myosin
• Tendon
• Antagonist muscles
• Synergist muscles
• Muscle tone
• Active rest

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