Nervous System Crossword

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Across
  1. 3. 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
  2. 5. neuron: Sensory neurons that carry nerve impulses from sensory stimuli towards the central nervous system and brain
  3. 7. neurotransmitter receptors: receive signals that trigger an electrical signal, by regulating the activity of ion channels.
  4. 9. a sensory receptor which receives stimuli from within the body, especially one that responds to position and movement.
  5. 12. nervous system: Controls the activities of the body. In vertebrates, comprises the brain and spinal cord.
  6. 13. nervous system: the nervous system outside the brain and spinal cord
  7. 16. a structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber.
  8. 18. nervous system: Controls bodily functions not consciously directed, such as breathing, the heartbeat, and digestive processes
  9. 19. a short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body.
  10. 20. membrane: specialized area of membrane of the axon terminal that faces the plasma membrane of the neuron or muscle fiber
  11. 23. bodies: the large granular body found in neurons.
  12. 24. neuron: motor neurons that carry neural impulses away from the central nervous system towards muscles to cause movement
  13. 25. long threadlike part of a nerve cell along which impulses are conducted from the cell body to other cells
  14. 26. of ranvier: a gap in the myelin sheath of a nerve, between adjacent Schwann cells.
Down
  1. 1. a chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse
  2. 2. body: nucleus-containing central part of a neuron
  3. 4. he site of transmission of electric nerve impulses between two nerve cells or between a neuron and a gland or muscle cell
  4. 6. a thing or event that evokes a specific functional reaction in an organ or tissue.
  5. 8. membrane: receives a signal from the presynaptic cell
  6. 10. cells: any of the cells in the peripheral nervous system that produce the myelin sheath around neuronal axons
  7. 11. a neuron which transmits impulses between other neurons, especially as part of a reflex arc
  8. 14. terminal: typically the sites where synapses with other neurons are found, and neurotransmitters are stored there to communicate with other neurons
  9. 15. nervous system: known as the voluntary nervous system. Consists of neurons that are associated with skeletal or striated muscle fibers and influence voluntary movements of the body.
  10. 17. feel that hold nerve cells in place and help them work the way they should
  11. 21. the fundamental units of the brain and nervous system. responsible for receiving sensory input from external world, sending motor commands to our muscles, transforming and relaying electrical signals.
  12. 22. sheath: insulating layer that forms around nerves, including those in brain and spinal cord. Allows electrical impulses to transmit quickly and efficiently along nerve cells.