Across
- 1. a fluid that helps soften food so that it can be swallowed more easily
- 5. microscopic air sacs
- 6. a structure that filters and destroys pathogens
- 7. is the oil produced by sebaceous glands
- 8. tube that allows urine to pass through the body
- 10. is a thin tissue that covers bone and contains nerves and blood vessels
- 12. a protein that helps regulate chemical reactions
- 13. an elongated fiber that carries impulses away from the cell body to the dendrites of another neuron
- 14. small fold in the lining of the small intestine that increase the surface area and allow more food to be absorbed
Down
- 2. a hormone that regulates blood sugar levels
- 3. the part of the brain that controls and coordinates muscle activity
- 4. the liquid component of blood that carries blood cells and dissolved materials
- 8. a pale yellow liquid composed of water salts and other waste products
- 9. two tubes through which air moves to the lungs
- 10. a dome shaped lesion that contains pus consisting of white blood cells, dead skin cells and bacteria
- 11. tough tissue fiber that attaches muscles to bone