Across
- 4. a signal transmitted along a nerve fiber
- 6. a bacterium, virus, or other microorganism that can cause disease
- 10. the ability of an organism to resist a particular infection or toxin by the action of specific antibodies or sensitized white blood cells
- 13. the molecules used by the nervous system to transmit messages between neurons, or from neurons to muscles
- 14. appendages that are designed to receive communications from other cells
- 17. a space that separates two neurons
- 18. occurs when the membrane potential of a specific cell location rapidly rises and falls
Down
- 1. pieces of very large cells in the bone marrow called megakaryocytes
- 2. one of the four major lobes of the cerebral cortex
- 3. a colorless cell that circulates in the blood and body fluids and is involved in counteracting foreign substances and disease; a white (blood) cell
- 5. treatment with a vaccine to produce immunity against a disease; inoculation
- 7. the fundamental units of the brain and nervous system
- 8. sheath that forms around nerves, including those in the brain and spinal cord
- 9. the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector)
- 11. a large phagocytic cell found in stationary form in the tissues or as a mobile white blood cell, especially at sites of infection
- 12. a toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies
- 15. a blood protein produced in response to and counteracting a specific antigen
- 16. the imbalance of electrical charge that exists between the interior of electrically excitable neurons (nerve cells) and their surroundings