Tone, Twitch, Types and Titles

Twitch

• Force and Endurance depend on…• FAST twitch (white)-low myoglobin• *fast, powerful contractions (eye movement, fingers)• *fatigue quickly• SLOW twitch (red)-high myoglobin• *extended contractions (postural muscles)• *slow to fatigue• Intermediate-both—calf muscle, sprint or stand

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Energy and ATP

• Aerobic-OXYGEN• *wasteCarbon dioxide and Water vapor

• Anaerobic –NO oxygen• *waste Lactic acid• Muscle FATIGUE-build up of lactic acid or lack

of ATP

How were these muscles named?

• Occipitofrontalis• Orbicularis oculi• Sternocleidomastoid• Transverse abdominis• Rectus abominis• Deltoid• Pectoralis major• Flexor carpi radialis

Muscle contraction

• 1. Ca+ diffuses across the sarcolemma into SR• 2. Troponin and tropomysin move away from

binding sites• 3. actin heads attaches to myosin strand• 4. actin head moves to center of sarcomere