1. Throwing a baseball overhead
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Muscle 1: Deltoids
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Action: Shoulder flexion; medial rotation
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Innervation: Axillary nerve (C5, C6)
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Muscle 2: Triceps Brachii
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Action: Elbow extension
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Innervation: Radial nerve (C6-C8)
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2. Kicking a ball
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Muscle 1: Rectus Femoris
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Action: Knee extension; hip flexion
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Innervation: Femoral nerve (L2-L4)
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Muscle 2: Gluteus Maximus
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Action: Hip extension; external rotation
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Innervation: Inferior gluteal nerve (L5-S2)
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3. Doing sit-ups
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Muscle 1: Rectus Abdominis
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Action: Trunk flexion
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Innervation: Thoracoabdominal nerves (T7-T11)
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Muscle 2: External Oblique
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Action: Flexion of the trunk; rotation to opposite sides
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Innervation: Thoracoabdominal nerves (T7-T11)
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4. Breathing
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Muscle 1: Diaphragm
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Action: Primary muscle of respiration; expansion of thoracic cavity
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Innervation: Phrenic nerve (C3-C5)
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Muscle 2: Intercostal muscles (External Intercostals)
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Action: Elevation of ribs during inspiration
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Innervation: Intercostal nerves (T1-T11)
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