ACTIVITY 2

ACTIVITY 2

ACTIVITY 2

by Kendrick Samson -
Number of replies: 0

Name at least two muscles that actively contracts during the following activities and name its action and innervation:

1. Throwing a baseball overhead:

  1. Deltoid

  • Action: Shoulder flexion and internal rotation

  • Innervation: Axillary nerve (C5, C6)

  1. Triceps Brachii

  • Action: Elbow extension

  • Innervation: Radial nerve (C6, C7, C8)

2. Kicking a ball

  1. Gastrocnemius

  • Action: Plantarflexion of the ankle and knee flexion

  • Innervation: Tibial nerve (S1, S2)

  1. Rectus Femoris

  • Action: Hip flexion and knee extension

  • Innervation: Femoral nerve (L2-L4)

3. Doing sit-ups

  1. Iliopsoas

  • Action: Hip flexion

  • Innervation: Femoral nerve (L2-L4)

  1. Rectus Abdominis

  • Action: Trunk flexion

  • Innervation: Thoracoabdominal nerves (T7-T11)

4. Breathing

  1. Diaphragm

  • Action: Primary muscle for inhalation, contracts to increase thoracic cavity volume

  • Innervation: Phrenic nerve (C3-C5)

  1. External Intercostals

  • Action: Elevates ribs during inhalation

  • Innervation: Intercostal nerves (T1-T11)