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Earth consists of two types of crust: lithospheric and oceanic.
Astrocyte
A type of star-shaped glial cell in the brain and spinal cord, involved in biochemical support of endothelial cells that form the blood-brain barrier.
Sensory Receptors
Specialized cells or nerve endings that respond to changes in the environment by generating signals that travel to the nervous system.
Action Potentials
Rapid, momentary changes in the electrical potential across a cell membrane, key in the transmission of nerve impulses.
Effectors
Organs, glands, or cells that act in response to stimuli, executing the responses of the nervous or hormonal system to external or internal changes.
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