BIOL 2160 Chapter 7: Chapter 7 (98% on the test)
Document Summary
Chapter 7: nerve cells & electric signaling: organization of the nervous system 7. 1. Functional: based upon direction impulses conducted. Sensory or afferent: conduct impulses from sensory or visceral receptors to cns. Motor or efferent: conduct impulses out of cns to effector organs (include motor neurons extending to skeletal muscle and neurons in ans. 99% of all neurons: located entirely within the cns, process sensory info from afferent, send commands to effector neurons, carry out thoughts, emotions & memory. Soma (cell body: contains nucleus and most organelles. Dendrites incoming: reception of incoming information. Axon hillock: transmits electrical impulses called action potentials over relatively long distances, where axon originates and action potentials initiated, all messengers must be strong enough to reach this point or message won"t be translated. Axon terminal (synaptic knobs or boutons: releases neurotransmitter (made in soma, space between a neuron & another cell: neuron, muscle gland. Can only move in that direction in all animals but jellyfish.
