1. Throwing a baseball overhead
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Deltoid
- Action: Abduction at shoulder
- Innervation: Axillary nerve
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Pectoralis major
- Action: Adduction and medial rotation at shoulder
- Innervation: Pectoral nerve
2. Kicking a ball
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Pectineus
- Action: Hip adduction and flexion
- Innervation: Femoral nerve
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Rectus femoris
- Action: Knee extension, hip flexion
- Innervation: Femoral nerve
3. Doing sit-ups
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Rectus abdominis
- Action: Flexion of vertebral column, compression of abdomen
- Innervation: Spinal nerves (T7-T12)
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Transverse abdominis
- Action: Compression of abdomen
- Innervation: First lumbar nerve (T7-L1), iliohypogastric nerve, ilioinguinal nerve
4. Breathing
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Diaphragm
- Action: Expansion of thoracic cavity
- Innervation: Phrenic nerve (C3-C5)
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External intercostals
- Action: Elevation of ribs
- Innervation: Intercostal nerve