Nervous systems receive sensory input, interpret it, and send out appropriate commands

Chapter 28, Problem 28.1

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Nervous systems receive sensory input, interpret it, and send out appropriate commands. The nervous system obtains and processes sensory information and sends commands to effector cells (such as muscle cells) that carry out appropriate responses. Sensory neurons conduct signals from sensory receptors to the central nervous system (CNS), which consists of the brain and, in vertebrates, the spinal cord. Interneurons in the CNS integrate information and send it to motor neurons. Motor neurons, in turn, convey signals to effector cells. Located outside the CNS, the peripheral nervous system (PNS) consists of nerves (bundles of sensory and motor neurons) and ganglia (clusters of cell bodies of the neurons).