Across
- 4. the relaying of a coded signal from a nerve cell to an effector (a muscle cell, a gland cell or another nerve cell) in response to a stimulus
- 6. an organism causing disease to its host
- 10. the immune system's way of protecting the body against an infectious disease
- 13. chemical messengers that your body can't function without
- 14. the finger-like cells present on the end of a neuron
- 17. a gap between the pre- and postsynaptic cells that is about 20 nm (0.02 μ) wide
- 18. a rapid sequence of changes in the voltage across a membrane
Down
- 1. A tiny, disc-shaped piece of cell that is found in the blood and spleen
- 2. sit behind the ears and are the second largest lobe
- 3. A type of blood cell that is made in the bone marrow and found in the blood and lymph tissue
- 5. The act of introducing a vaccine into the body to produce protection from a specific disease
- 7. nerve cells that send messages all over your body to allow you to do everything from breathing to talking, eating, walking, and thinking
- 8. an insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord
- 9. a structure that permits a neuron (or nerve cell) to pass an electrical or chemical signal to another neuron or to the target effector cell
- 11. A type of white blood cell that surrounds and kills microorganisms, removes dead cells, and stimulates the action of other immune system cells
- 12. Any substance that causes the body to make an immune response against that substance
- 15. A protein made by plasma cells (a type of white blood cell) in response to an antigen
- 16. the amount of power that is available to a cell to maintain its homeostatic state