Across
- 1. Basic structural and functional unit of life
- 6. Longest muscle in the human body
- 10. Simple sugar; primary energy source
- 11. Hormone that reduces blood glucose
- 12. Powerhouse of the cell
- 14. Stores genetic information
- 16. Hollow muscular organ that pumps blood
- 18. Fluid component of blood
- 20. Main intracellular cation
- 21. Valve between left atrium and ventricle
Down
- 2. Enzyme that breaks down lactose
- 3. Longest bone in the human body
- 4. Protein responsible for oxygen transport in blood
- 5. Basic contractile unit of skeletal muscle
- 7. Long projection that transmits nerve impulses
- 8. Main extracellular cation
- 9. Functional unit of the nervous system
- 13. Bone-forming cells
- 15. Biological catalyst that speeds up reactions
- 17. Primary muscle protein that binds actin during contraction
- 19. Largest gland in the human body