responding to the environment: nervous system

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Across
  1. 2. forms the lowest part of the brain stem, acts as a reflex center and controls vitalprocesses( 2wrds)
  2. 5. The long threadlike part of a nerve cell which conducts impulse away from the cell body
  3. 6. when organs are innervated by both parasympathetic and sympathetic nerve fibres (2wrds)
  4. 7. a part of the brain and spinal cord made up of cell bodies made of neurons dendrites and synapses (2wrds)
  5. 9. the efferent neurons that carry impulses away from the central nervous system and towards the effectors
  6. 10. A junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of neurotransmitters
  7. 12. type of reflex that activates skeletal muscles
  8. 13. A part of the neuron that conducts impulses towards the cell body
  9. 16. The part of the nervous system made up of cranial and spinal nerves
  10. 17. Are muscles or glands that cause a response to the message from the nervous system
  11. 19. an autoimmune disease characterized by the breakdown of the myelin sheaths in the central nervous system (2wrds)
  12. 21. The part of the nervous system that consist of a mass of interconnected neurons that form the brain and spinal cord
  13. 22. part of a neuron that controls the metabolism of the cell(2wrds)
  14. 24. a fast automatic response by an effector organ to a stimulus brought about by a receptor organ (2 wrds)
  15. 25. fluid formed from blood plasma in special areas in the walls of the ventricles of the brain
  16. 31. a structure that divides the cerebrum into two central hemispheres(2wrds)
  17. 32. a system that allows communication between receptors and the effectors of the body so that correct reactions to any change in the environment can be bought about
  18. 33. A detectable change that will be received by a receptor and converted into an impulse
Down
  1. 1. The part of the peripheral nervous system that controls involuntary action
  2. 2. protective membranes surrounding the brain and the spinal cord
  3. 3. Progressive incurable mental deterioration that can occur in middle or old age, due to generalized degeneration of the brain
  4. 4. type of synapse between terminal branches of a motor neuron and a muscle
  5. 8. forms electrical insulation around the neuron to prevent impulses from being disrupted by activity from nearby cells(2wrds)
  6. 11. bundles of neurons consisting of nerve fibers
  7. 14. Structures located in the sense organs. They convert a stimulus into an impulse
  8. 15. a part of the brain and spinal cord made up of axons and myeline sheaths(2wrds)
  9. 18. chemical substance released at a synapse from axon terminals to carry impulses across the gap
  10. 20. Neuron that carries impulses to the Central Nervous System from receptors
  11. 21. a part of the skull the contains and protects the brain
  12. 23. a system that responds the fastest by impulse along nerves to the brain and other parts of the body
  13. 26. neural pathway followed by impulses from a receptor to an effector to brig about a movement (2 wrds)
  14. 27. collection of neural cell bodies
  15. 28. The structure made from bundles of myelinated nerve fibers that connects the left and right hemispheres of the brain, allowing communication between them (2wrds)
  16. 29. Specialised nerve cells found in the nervous system that form the structural units of nerves
  17. 30. type of reflex that activates smooth or cardiac muscles