Day 9

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Across
  1. 4. a signal transmitted along a nerve fiber. It consists of a wave of electrical depolarization that reverses the potential difference across the nerve cell membranes.
  2. 6. a bacterium, virus, or other microorganism that can cause disease.
  3. 10. achieved through the presence of antibodies to that disease in a person's system
  4. 13. a chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse and, by diffusing across the synapse or junction, causes the transfer of the impulse to another nerve fiber, a muscle fiber, or some other structure.
  5. 14. appendages that are designed to receive communications from other cells
  6. 17. the space between neurons at a nerve synapse across which a nerve impulse is transmitted by a neurotransmitter
  7. 18. a rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane with a characteristic pattern.
Down
  1. 1. pieces of very large cells in the bone marrow called megakaryocytes.
  2. 2. one of the four major lobes of the cerebral cortex
  3. 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. There are several types, all amoeboid cells with a nucleus, including lymphocytes, granulocytes, monocytes, and macrophages.
  4. 5. a biological product that can be used to safely induce an immune response that confers protection against infection and/or disease on subsequent exposure to a pathogen
  5. 7. an electrically excitable cell that communicates with other cells via specialized connections called synapses
  6. 8. an insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord
  7. 9. asymmetric intercellular junctions that mediate rapid point-to-point communication between neurons, and thereby connect neurons into circuits
  8. 11. a large phagocytic cell found in stationary form in the tissues or as a mobile white blood cell, especially at sites of infection.
  9. 12. a toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies.
  10. 15. a blood protein produced in response to and counteracting a specific antigen. Antibodies combine chemically with substances which the body recognizes as alien, such as bacteria, viruses, and foreign substances in the blood.
  11. 16. the electrical potential of a neuron or other excitable cell relative to its surroundings when not stimulated or involved in passage of an impulse.