1. Turning a door knob
a. Biceps brachii
ACTION: Flexes forearm at elbow joint supinates forearm at radioulnar joints, and flexes arm at shoulder joint
INNERVATION: Musculocutaneous nerve
b. Flexor carpi radialis
ACTION: Flexes and abducts hand at wrist joint
INNERVATION: Median nerve
c. Abductor pollicis brevis
ACTION: Abducts thumb at carpometacarpal joint
INNERVATION: Median nerve
2. Throwing a baseball overhead
a. Subscapularis
ACTION: Medially rotates arm at shoulder joint
INNERVATION: Upper and lower subscapular nerve
b. Triceps brachii
ACTION: Extends forearm at elbow joint and extends arm at shoulder joint
INNERVATION: Radial nerve
c. Pectoralis major
ACTION: adducts and medially rotates arm at shoulder joint
INNERVATION: Medial and lateral pectoral nerves
3. Kicking a ball
a. Adductor magnus
ACTION: Adducts thigh at hip joint, medially rotates thigh, and flexes leg at knee joint
INNERVATION: Obturator nerve
b. Tibialis anterior
ACTION: Dorsiflexes foot at ankle joint and inverts foot at intertarsal joints
INNERVATION: Deep fibular nerve
c. Extensor hallucis brevis
ACTION: Extends great toe at metatarsophalangeal joint
INNERVATION: Deep fibular nerve
4. Doing sit-ups
a. Rectus abdominis
ACTION: Flexes vertebral column, especially lumbar portion, and compresses abdomen to aid in defecation, urination, forced exhalation and childbirth
INNERVATION: Thoracic spinal nerves T7–T12
b. External oblique
ACTION: compress abdomen and flex vertebral column
INNERVATION: Thoracic spinal nerves T7–T12 and the iliohypogastric nerve
c. Internal oblique
ACTION: compress abdomen and flex vertebral column
INNERVATION: Thoracic spinal nerves T8–T12, the iliohypogastric nerve, and and ilioinguinal nerve
5. Walking
a. Tensor fasciae latae
ACTION: Flexes and abducts thigh at hip joint
INNERVATION: Superior gluteal nerve
b. Tibialis anterior
ACTION: Dorsiflexes foot at ankle joint and inverts foot at intertarsal joints
INNERVATION: Deep fibular nerve
c. Extensor hallucis brevis
ACTION: Extends great toe at metatarsophalangeal joint
INNERVATION: Deep fibular nerve
6. Breathing
a. Diaphragm
ACTION: inhalation, exhalation
INNERVATION: Phrenic nerve
b. External intercostals
ACTION: inhalation, exhalation
INNERVATION: Thoracic spinal nerves T2–T12
c. Internal intercostals
ACTION: draws adjacent ribs together
INNERVATION: Thoracic spinal nerves T2–T12