BIO203H5 Lecture Notes - Central Nervous System, Electrochemical Gradient, Peripheral Nervous System

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Info they carry originates in sensory cells that are located in periphery of body. Sensory info inside eyes, ears, nose transmit streams of data about external env in form of signals. A sensory receptor transmits the information it receives from the environment by means of a nerve cell called a sensory neuron. In vertebrates, the sensory neuron sends the information to neurons in the brain or spinal cord via nerves long, tough strands of nervous tissue, containing thousands of neurons. The central nervous system (cns), made up of the brain and spinal cord, integrates information from many sensory neurons. Cells in the cns called interneurons make connections between sensory neurons and motor neurons, which are nerve cells that send signals to effector cells in glands or muscles. All of the components of the nervous system outside the cns are part of the peripheral nervous system (pns).

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