ACTIVITY 2

ACTIVITY 2

ACTIVITY 2

by Sophia Klarisse Saur -
Number of replies: 0
  1. Throwing a baseball overhead
    Muscle 1: Subscapularis
         Action: Medially rotates arm at shoulder joint
         Innervation: Upper and lower subscapular nerve
    Muscle 2: Latissimus dorsi
         Action: Extends, adducts, and medially rotates arm at shoulder joint; draws arm inferiorly and posteriorly. RMA: Elevates vertebral column and torso


  2. Kicking a ball


         Innervation: Femoral nerve
    Muscle 2: Biceps femoris
         Action: Flexes leg at knee joint and extends thigh at hip joint
         Innervation: Tibial and fibular nerves from sciatic nerve

  3. Doing sit-ups
    Muscle 1: Transversus abdominis
         Action: Compresses abdomen
         Innervation: Thoracic spinal nerves T8–T12, iliohypogastric nerve, and ilioinguinal nerve
    Muscle 2: Rectus abdominis
         Action: Flexes vertebral column, especially lumbar portion, and compresses abdomen to aid in defecation, urination, forced exhalation, and childbirth. RMA: Flexes pelvis on the vertebral column
         Innervation: Thoracic spinal nerves T7–T12

  4. Breathing
    Muscle 1: Diaphragm
         Action: Contraction of diaphragm causes it to flatten and increases vertical dimension of thoracic cavity, resulting in inhalation; relaxation of diaphragm causes it to move superiorly and decreases vertical dimension of thoracic cavity, resulting in exhalation
         Innervation: Phrenic nerve (which contains axons from cervical spinal nerves (C3–C5))
    Muscle 2: External intercostals
         Action: Contraction elevates ribs and increases anteroposterior and lateral dimensions of thoracic cavity, resulting in inhalation; relaxation depresses ribs and decreases anteroposterior and lateral dimensions of thoracic cavity, resulting in exhalation.
         Innervation: Thoracic spinal nerves T2–T12