Across
- 2. bring electrical signals to the cell body
- 5. Nerves outside brain and spinal cord (2 words)
- 6. A nerve cell found entirely within the central nervous system that acts as a link between sensory neurons and motor neurons. (2 words)
- 8. a molecule usually found on the surface of a cell, that receives chemical signals from outside the cell.
- 11. The actual mass of an atom basically depends on the numbers of protons and neutrons in its nucleus. (3 words)
- 14. a nerve cell that conducts impulses from the periphery of the body to the central nervous system. (2 words)
- 16. Occurs when the result of a process influences the operation of the process itself in such a way as to reduce changes (2 words)
- 18. a reaction to an action
- 19. the highway along which your brain sends and receives information about what is happening in the body and around it. (2 words)
- 20. A signal that is sent throughout the cells in body.
Down
- 1. Nerve fibre that take information away from the cell body
- 3. a small molecule that selectively binds to a protein and regulates its biological activity. (2 words)
- 4. The control room of the human body
- 7. have many processes that extend from the cell body. However, each neuron has only one axon (2 words)
- 9. The object which pumps blood and keeps you alive
- 10. A neuron that conveys impulses from the central nervous system to a muscle, gland, or other effector tissue. (2 words)
- 12. System made of hormones (2 words)
- 13. The relatively constant conditions within organisms, or the physiological processes by which such conditions are maintained in the face of external variation.
- 15. Nerve cell body
- 17. Something that causes a response