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Throwing a baseball overhead
Muscle Active: Infraspinatus
Action: Laterally rotates arm at shoulder arm
Innervation: Suprascapular nerve
Muscle Active: Biceps brachii
Action: Flexes forearm at elbow joint, supinates forearm at radioulnar joints, and flexes arm at shoulder joint
Innervation: Musculocutaneous nerve
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Kicking a ball
Muscle Active: Quadriceps Femoris (Rectus femoris, vastus lateralis, vastus medialis, vastus intermedius)
Action: Extend leg at knee joint; Rectus femoris flexes thigh at hip joint
Innervation: Femoral nerve
Muscle Active: Gluteus maximus
Action: Extends thigh at hip joint and laterally rotates thigh; helps lock knee in extension
Innervation: Inferior gluteal nerve
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Doing sit-ups
Muscle Active: Rectus Abdominis
Action: Flexes vertebral column, compresses abdomen
Innervation: Thoracic spinal nerves T7 - T12
Muscle Active: Transverse Abdominis
Action: Compresses abdomen
Innervation: Thoracic spinal nerves T8 - T12, iliohypogastric nerve, ilioinguinal nerve
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Breathing
Muscle Active: Diaphragm
Action: Contraction increases vertical dimension of thoracic cavity, resulting in inhalation; Relaxation decreases vertical dimension of thoracic cavity, resulting in exhalation
Innervation: Phrenic nerve
Muscle Active: External intercostal
Action: Contraction elevates ribs and increases anteroposterior and lateral dimensions; relaxation depresses ribs and decreases anteroposterior and lateral dimensions
Innervation: Thoracic spinal nerves T2-T12