Nervous System Terms and Concepts

123456789101112131415161718192021
Across
  1. 5. The Central Nervous System (CNS) consists of the spinal cord and this major organ.
  2. 6. These are the branch-like parts of the neuron that receive nerve impulses from a neighboring neuron.
  3. 7. The cell body of a neuron is known as the ___.
  4. 8. The three major types of human muscles are smooth, skeletal, and ___ muscles.
  5. 11. This is described as any factor in the environment (internal or external) that causes a response or a reaction.
  6. 13. The __ nervous system is the subdivision of the Peripheral Nervous System that is involved with voluntary responses such as writing or lifting an object.
  7. 17. Chemical messengers that get released into the synaptic cleft between two neurons are known as ____.
  8. 19. The nervous system and the ___ system are the two human body systems that are most directly responsible for controlling the body and maintaining homeostasis.
  9. 20. Signals in the nervous system can be electrical or ____.
  10. 21. Efferent neurons are also known as ___ neurons, and they carry signals fro the CNS to muscles in order to cause movement.
Down
  1. 1. The ___ portion of the Peripheral Nervous System is involved with responses that are involuntary or that you cannot consciously control.
  2. 2. This is the general name for a specialized cell of the nervous system.
  3. 3. The ___ portion of the autonomic nervous system acts to "undo" the actions of the sympathetic nervous system
  4. 4. Afferent neurons carry signals to the brain and/or spinal cord, and they are also known as ___ neurons.
  5. 9. The human nervous system is divided into two major departments: the Central Nervous System and the ___ Nervous System.
  6. 10. The area between the axon terminals of one neuron and the dendrites of another neuron is known as the ___.
  7. 12. ___ is another terms for a nerve impulse or "strike." (two words with no spaces between)
  8. 14. Nerve impulses or action potentials move along neurons in only ___ direction.
  9. 15. The sympathetic portion of the autonomic nervous system is responsible for your "___ or Flight" response to stress and danger.
  10. 16. The axon is covered in ___ sheaths which act as insulators and allow a nerve impulse to move quickly and smoothly.
  11. 18. The ___ is the long, slender portion of the neuron that transmits a nerve impulse to the end of the neuron.