Across
- 2. Disease that causes alveoli to disintegrate
- 3. Sets the tempo of the heart beat
- 4. Voltage across the plasma membrane of a resting neuron
- 6. Clusters of air sacs
- 7. Nerve cell specialized for carrying signals from one part of the body to another
- 8. Consists of 4 polypeptide chains heme and iron
- 11. Force of blood exerts against the walls of the blood vessels
- 12. Smaller branches or bronchi
- 13. Function is to prevent backflow of blood
- 14. Fluid is pumped through open-ended vessels and flows among cells
- 19. 10-14 inhalations per minute
- 20. Communication line made from bundles of neuron fibers wrapped in connective tissue
- 21. Abbreviation of central nervous system
- 23. Sheet of respiratory muscle
- 24. Arteries, arterioles, capillaries, venules, veins
- 26. Anything that causes a nerve signal to start
Down
- 1. Several organs that facilitate gas exchange
- 3. What PNS is short for
- 5. Windpipe
- 9. Heart chamber that receives blood
- 10. Lead to each lung
- 13. Heart chamber that pumps blood away from heart
- 15. Rhythmic contraction and relaxation of the heart
- 16. Voice box
- 17. Relays signals to another neuron or effector
- 18. Bundle of nerve fibers inside the spinal column
- 19. Erythrocytes
- 22. Long, single fiber, conducts signal toward another neuron or effector
- 24. Master control center
- 25. Blood type ___ can donate blood to anyone but can only receive blood from one specific blood type