CHEM 112 Lecture Notes - Lecture 2: Signal Transduction, Neuroglia, Sensory Neuron

21 views4 pages

Document Summary

Cells that send and receive electrical and chemical signals to and from other neurons in the nervous system. Number varies widely as function of size and behavioural complexity. Nerve: has hundreds of neurons, with associated glial cells. Glial cells: cells that produce the connective tissue and organize the zones around the neurons, producing myelin for certain nerves. Nerves transmit info within the pns, and b/w the pns and cns. Nerves that are entirely within the brain and spinal cord are called tracts. Myelin sheath: formed by glial cells that covers the axon to insulate it and make impulses travel along the axon faster and more efficient. Sensory neurons: detect information from the physical world and pass info to the brain. Motor neurons: direct muscles to relax or contract, producing movement. Interneurons: link sensory and motor neurons together and work to integrate and communicate information. Sensory receptors are usually specialized neurons or epithelial cells that detect external or internal stimuli.