1. Throwing a Baseball Overhead
Muscle: Deltoid
Action: Flexes and medially rotates the arm; assists in raising the arm overhead.
Innervation: Axillary nerve
Muscle: Triceps brachii
Action: Extends the elbow and assists with shoulder extension during the throwing motion
Innervation: Radial nerve
2. Kicking a Ball
Muscle: Quadriceps femoris (rectus femoris)
Action: Extends the knee and assists with hip flexion
Innervation: Femoral nerve
Muscle 2: Gluteus maximus
Action: Extends and laterally rotates the hip, helping to drive the leg backward before the kick
Innervation: Inferior gluteal nerve
3. Doing Sit-Ups
Muscle: Rectus abdominis
Action: Flexes the vertebral column (spine), bringing the rib cage toward the pelvis
Innervation: Lower intercostal nerves and subcostal nerve
Muscle: Iliopsoas (psoas major and iliacus)
Action: Flexes the hip joint, pulling the thighs toward the abdomen during the sit-up motion
Innervation: Femoral nerve (iliacus) and L1-L3 nerves (psoas major)
4. Breathing
Muscle 1: Diaphragm
Action: Contracts during inhalation, moving downward to increase the volume of the thoracic cavity, allowing air to enter the lungs
Innervation: Phrenic nerve
Muscle : External intercostal muscles
Action: Elevates the ribs during inhalation, expanding the chest and aiding in lung expansion
Innervation: Intercostal nerves