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# Section 11.2 Your Muscular System ## Muscle Tone * Even when a skeletal muscle is not contracting, a few of its individual muscle fibers are still contracting. * Contractions tense and firm the muscle. * This slight tension is called muscle tone. * Muscles that cannot contract due to injury, or...

# Section 11.2 Your Muscular System ## Muscle Tone * Even when a skeletal muscle is not contracting, a few of its individual muscle fibers are still contracting. * Contractions tense and firm the muscle. * This slight tension is called muscle tone. * Muscles that cannot contract due to injury, or are not used often, will weaken and shrink, a condition known as atrophy. ## The Muscular System The image contains a diagram of the human body with labels for different muscles. **List of Muscles:** 1. Frontalis 2. Temporalis 3. Trapezius 4. Deltoid 5. Pectoralis major 6. Sartorius 7. Tibialis anterior 8. Biceps 9. Triceps 10. External oblique 11. Rectus abdominus 12. Quadriceps muscles 13. Gastrocnemius ## Keeping Healthy * You can maintain a healthy muscular system by regularly participating in different types of exercise. * To help prevent injuries, exercise sessions should include a warm-up and cool-down period. ## Working Your Muscles * Some types of exercise increase a muscle's endurance, how long it can contract without tiring. * Other exercises make individual muscle fibers grow and increase in strength, which causes the muscles to thicken.