Throwing Baseball overhead
- Muscle: Brachialis
Actions: Flexes forearm at elbow joint.
Innervation: Musculocutaneous and racial nerves.
- Muscle: Triceps Brachii
Action: Extends forearm at elbow joint and extends arm at shoulder joint.
Innervation: Radial Nerve.
Kicking Ball
- Muscle: Tibialis Anterior
Actions: Dorsiflexes foot at ankle joint and inverts (supinates) foot at intertarsal joints.
Innervation: Deep fibular (peroneal) nerve.
- Muscle: Fibularis (Peroneus) Tertius
Action: Dorsiflexes foot at ankle joint and everts (pronates) foot at intertarsal joints.
Innervation: Deep fibular (peroneal) nerve.
Doing Sit-ups
- Muscle: Rectus Abdominis
Actions: Flexes the vertebral column and compresses abdominal contents.
Innervation: Intercostal nerves (T7-T11), subcostal nerve (T12).
- Muscle: Vastus Lateralis
Action: Extend leg at knee joint; rectus femoris muscle acting alone also flexes thigh at hip joint.
Innervation: Femoral nerve.
Breathing
- Muscle: Diaphragm
Actions: Contracts to increase thoracic Volume.
Innervation: Phrenic Nerve (C3-C5).
- Muscle: Internal Intercostals
Action: Elevates the ribs to expand the chest during inhalation.
Innervation: Thoracic Spinal nerves T2-T12.