Across
- 3. Carries impulses from the body’s sense organs to the CNS as well as transmits commands from the CNS to muscle tissue.
- 6. A group of small swellings at the end of the axon.
- 8. This column of nerve tissue extends from the vertebral canal up into the bottom of the skull.
- 11. An insulating membrane of fatty cells along the axon which help to increase the speed of a nerve impulse.
- 15. The receiving neuron of an impulse carried across the synaptic cleft.
- 17. Carries impulses between the sensory and motor neurons.
- 19. Carries the impulse across the synapse to a receiving neuron.
- 20. A chemical substance that alters the body in some structural or physiological way.
- 21. The most common form of dementia. An impairment of the brain’s intellectual functions such as orientation and memory.
- 23. This class of drugs duplicate naturally occurring endorphins in the brain. Endorphins are the body’s pain killers.
- 24. A neural inhibitor released into the synapse to bind with and deactivate a neurotransmitter.
- 26. Most of the metabolic activity of any neuron occurs within this.
- 28. This disorder ranges from specific phobias to more generalized feelings of worry and tension.
- 29. This disease is marked by headache and fever, a sensitivity to light and muscular rigidity.
- 30. A neurological disorder that results in sudden and recurring seizures associated with abnormal electrical activity in the brain.
Down
- 1. The control centre of the body. It receives sensory information and activates motor control.
- 2. A serious mental illness. Symptoms include indecision, inattention, poor memory, hallucinations and delusions, chaotic thinking, social withdrawal and depression.
- 4. Occurs after the sole of the foot has been firmly stroked. The big toe then moves upward or toward the top surface of the foot.
- 5. The fluid-filled space between adjoining neurons.
- 7. These nerve cells carry messages from the brain and spinal cord to effectors such as muscles and glands.
- 9. A common type of neurotransmitter used to open sodium ion gates on the dendrites of a neighboring neuron.
- 10. These nerve cells receive impulses and carry them from the sense organs to the spinal cord or brain.
- 12. The minimum level of a stimulus needed to activate a neural impulse.
- 13. A chemical messenger released from a neuron into a synapse in order to stimulate the next neuron in its path.
- 14. The neuron cell membrane uses this energy to pump ions (Na+) out of the cell and potassium ions (K+) into the cell.
- 16. The largest region of the brain. Divided into left and right hemispheres and connected by the corpus callosum.
- 18. A gap between Schwann cells along the axon of the nerve cell that may serve to increase the speed of an electrical impulse.
- 22. An involuntary and nearly immediate movement in response to a stimulus.
- 25. A reflex that controls the diameter of the pupil, in response to the intensity of light that falls on the retinal ganglion cells of the retina in the back of the eye, thereby assisting in adaptation.
- 27. These branched extensions of the cell body pick up and carry the electrical impulses toward the cell body.