Nervous System Crossword

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Across
  1. 7. Consists of the brain and spinal cord. It combines information from the entire body and coordinates activity across the whole organism.
  2. 9. Receptors- Receives signals that trigger an electrical signal, by regulating the activity of ion channels. The influx of ions through ion channels opened due to the binding of neurotransmitters to specific receptors can change the membrane potential of a neuron.
  3. 10. A long slender fibre of a neuron and is responsible for conducting nerve impulses away from the cell soma to a synapse
  4. 11. Is an electrically excitable cell that communicates with other cells via specialized connections called synapses.
  5. 12. A whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs.
  6. 13. Any of the threadlike extensions or projections of the cytoplasm of a neuron.
  7. 14. 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.
  8. 16. The site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector).
  9. 18. Is a stabbing, burning, and often severe pain due to an irritated or damaged nerve.
  10. 19. A mass of nerve cell bodies outside the central nervous system.
  11. 20. Is the spherical part of the neuron that contains the nucleus.
  12. 21. Is the part of the peripheral nervous system associated with the voluntary control of body movements via skeletal muscles.
  13. 23. A gap in the myelin sheath of a nerve, between adjacent Schwann cells.
  14. 25. Is a specialized area of membrane of the axon terminal that faces the plasma membrane of the neuron or muscle fiber with which the axon terminal establishes a synaptic junction.
  15. 26. Is a large granular body found in neurons. These granules are of rough endoplasmic reticulum (RER) with rosettes of free ribosomes, and are the site of protein synthesis.
Down
  1. 1. Is any of the button-like endings of axons through which axons make synaptic contacts with other nerve cells or with effector cells.
  2. 2. Are sleeves of fatty tissue that protect your nerve cells.
  3. 3. Any local circuit neuron of the central nervous system that relays impulses between sensory neuron and motor neuron.
  4. 4. A neuron with an axon that carries nerve impulses peripherally, and innervates effectors such as muscles and glands.
  5. 5. The main function is to connect the CNS to the limbs and organs, essentially serving as a relay between the brain and spinal cord and the rest of the body.
  6. 6. Is the membrane that receives a signal (binds neurotransmitter) from the presynaptic cell and responds via depolarisation or hyperpolarisation.
  7. 8. A sensory receptor which receives stimuli from within the body, especially one that responds to position and movement.
  8. 15. Are the messenger neurons that bring the information from different parts of the body to the central nervous system (CNS).
  9. 17. Is a division of the peripheral nervous system that supplies smooth muscle and glands, and thus influences the function of internal organs.
  10. 22. A thing or event that evokes a specific functional reaction in an organ or tissue.
  11. 24. Are a type of glial cells of the peripheral nervous system that help form the myelin sheath around the nerve fibers. They envelop and rotate around the axon forming the myelin sheath, now the axon is myelinated.