Across
- a special neuron that changes light into electrical impulses
- _________ protect the spinal cord.
- a collection of nerve fibers through which impulses travel between the central nervous system and other parts of the body
- the largest part of your brain
- a substance that is made in one cell or tissue and that causes a change in another cell or tissue in a different part of the body
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Down
- the mass of nerve tissue that is the main control center of the nervous system
- a fluid-filled organ of the inner ear
- a group of cells that make special chemicals fo the body
- Part of the brain that connects to your spinal cord
- a nerve cell that is specialized to receive and conduct electrical impulses
- a layer of light-sensitive cells
- Your __________ causes skeletal muscles to make adjustments so that you will stay upright.
- an involuntary and almost immediate movement in response to a stimulus
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