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| change in the environment |
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| largest part of the neuron, which contains the nucleus |
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| threadlike structure in the neuron that carries messages to the cell body |
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| tail-like fiber that carries messages away from the cell body |
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| special cell that receives information from its surroundings |
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| type of neuron that carries messages from the receptors to the brain or spinal cord |
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| type of neuron that connects sensory and motor neurons |
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| type of neuron that carries messages from the brain and spinal cord to an effector |
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| muscle cell or gland cell that is stimulated by a motor neuron |
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| electrical and chemical signals that travel across a neuron |
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| tiny gap between two neurons |
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| main control center of the central nervous system |
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| provides the link between the brain and the rest of the body |
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| largest part of the brain; controls the senses, thought, and conscious activity |
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| part of the brain that controls balance and coordinates muscle activity |
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| part of the brain that controls involuntary actions |
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| simple response to a stimulus |
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| transparent protective covering of the eye |
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| circular, colored portion of the eye |
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| small opening in the middle of the eye |
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| part of the eye that focuses light rays coming into the eye |
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| inner layer of the eye on which an image is focused; contains the light-sensitive rods and cones |
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| membrane in the ear that vibrates when struck by sound waves |
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| snail-shaped tube in the inner ear from which nerve impulses are carried to the brain |
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| tiny canal in the inner ear that is responsible for the sense of balance |
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| chemical messenger produces by an endocrine gland |
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| endocrine gland at base of brain that provides a link between the nervouse system and the endocrine system |
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| endocrine gland located below the hypothalamus that controls many body processes |
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| endocrine gland that is responsible for the development of the immune system |
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| endocrine gland located in the neck that produces a hormone which controls how quickly food is burned up |
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| endocrine gland embedded in the thyroid that produces a hormone which controls the level of calcium in the blood |
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| endocrine gland on top of each kidney that produces the hormone adrenaline |
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| small group of cells in the pancreas that produce the hormones insulin and glucagon |
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| endocrine gland that produces female hormones; female sex gland |
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| endocrine glands that produce male hormones; male sex gland |
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| negative feedback mechanism |
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| mechanism by which the production of a hormone is controlled by the amount of another hormone |
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| receives and sends out information about activities within the body and monitors and responds to changes in the environment |
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Definition
| What does the nervous system do? |
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| the cell body, dendrites, an axon and axon terminals |
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| Name the parts of the neuron. |
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| composed of the brain and the spinal cord |
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| the cerebrum, the cerebellum, and the medulla |
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Definition
| What are the three parts of the brain? |
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| peripheral nervous system |
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| consists of all the nerves that connect to the central nervous system |
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| consists of two sets of nerves that have opposite effects on the organs they control; one group triggers action by an organ while the other group slows down or stops the action |
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| sense organs (i.e. eyes, ears, nose, tongue and skin) |
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| These respond to light, sound, heat, pressure, and chemicals and also detect changes in the position of your body |
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| fluid in a chamber just inside the cornea |
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| light entering the eye passes through the cornea, aqueous humor, lens, vitreous humor to the retina where an optic nerve carries the impulses to the brain |
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Definition
| How does light travel from the eye to the brain? |
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