12. Which bone is considered part of the axial skeleton? A. Humerus C. Sternum E. Scapula 13. What type of cartilage is primarily found in the intervertebral discs? B. Elastic Cartilage D. Articular Cartilage E. Costal Cartilage 14. The main structural units of compact bone are called: A. Lamellae B. Trabeculae C. Osteons E. Canals 15. What type of ossification occurs directly from mesenchymal tissue? A. Endochondral Ossification B. Intramembranous Ossification D. Subperiosteal Ossification E. Chondral Ossification 16. Which movement occurs when the angle between two bones increases? A. Flexion C. Abduction D Rotation E. Circumduction 17. The thoracic cavity houses which of the following structures? A. Brain and Spinal Cord B. Liver and Stomach C. Lungs and Heart D. Kidneys and Pancreas E. Pelvic Organs 18. Which type of body membrane is found lining the cavities of synovial joints? A. Serous Membrane B. Cutaneous Membrane C. Synovial Membrane E. Fibrous Membrane 19. Which directional term refers to a structure closer to the midline of the body? A. Lateral B. Distal D. Proximal E. Superficial 20. The anatomical region associated with the armpit is known as: A. Cervical C. Brachial D. Pectoral E. Lumbar 21.Which anatomical plane divides the body into upper and lower portions? A. Sagittal Plane C. Transverse Plane