Across
- 2. the strongest and largest bone in the body
- 6. largest organ in the body
- 7. hormone released by the adrenal gland and involved in the sympathetic nervous system
- 9. which section of the spinal cord has 12 vertebrae
Down
- 1. air flowing in and out of lungs
- 3. the system that controls hormones
- 4. the type of artery that carries unoxygenated blood
- 5. the valve that that leads from the right atrium to the right ventricle
- 6. the only muscle that is voluntary
- 8. Node the primary pacemaker of the heart