Activity 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
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Muscle 2: Triceps Brachii
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Action: Elbow extension
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Innervation: Radial nerve
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Activity 2: Kicking a Ball
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Muscle 1: Quadriceps femoris (rectus femoris)
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Action: Extends the knee and assists with hip flexion
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Innervation: Femoral nerve
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Muscle 2: Gluteus maximus
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Action: Extends and laterally rotates the hip, helping to drive the leg backward before the kick
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Innervation: Inferior gluteal nerve
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Activity 3: Doing sit-ups
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Muscle 1: Transversus abdominis
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Action: Compresses abdomen
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nnervation: Thoracic spinal nerves T8–T12, iliohypogastric nerve, and ilioinguinal nerve.
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Muscle 2: Rectus abdominis
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Action: Flexes vertebral column, flexes pelvis on thevertebral column.
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Innervation: Thoracic spinal nerves T7–T12.
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Activity 4: Breathing
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Muscle 1: Diaphragm
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Action: Contraction causes it to flatten, increasing volume in the thoracic cavity and leading to inhalation. Relaxation decreases the volume in the cavity leading to exhalation.
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Innervation: Phrenic nerve
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Muscle 2: External intercostals
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Action: Contraction elevates ribs resulting in inhalation; relaxation depresses ribs resulting in exhalation.
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Innervation: Thoracic spinal nerves T2–T12.
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