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