Across
- 5. The gas we exhale
- 6. Little holes insects use to breathe
- 7. Valve that prevents for from entering the trachea
- 8. The number of bones in an adult skeleton
- 10. Muscle that controls air pressure in the lungs
- 11. The gap between two neurons
- 13. Accessory organ in the digestive system that makes insulin and enzymes
- 17. Connects muscle to bone
- 19. Small blood vessel that allows for nutrient exchange
- 21. The part of your skeleton containing the skull and spine
- 22. Type of bone whose structure changes based on your activity level
- 23. An accessory structure in your skin that helps you cool off
Down
- 1. Connects bone to bone
- 2. The number of chambers in the heart
- 3. Carries deoxygenated blood
- 4. Receptors in the eye that detect color
- 5. The body’s primary energy source
- 6. The body’s largest organ
- 9. Part of a neuron that receives incoming signals
- 12. Membrane what vibrates when you hear something
- 14. A substance that serves as a catalyst to help break things down
- 15. At birth, your bones are mostly made of this
- 16. Digestive organ where nutrients are absorbed
- 18. Process that moves oxygen from the lungs to the blood
- 20. Division of the peripheral nervous system controlling involuntary actions