BIOL 235: Chapter 12 (100% correct answers)

nerve correct answers a bundle of hundreds of thousands of axons plus associated connective tissue and blood vessels that lies outside of brain and spinal cord (in the PNS) cranial nerves correct answers 12 pairs emerge from the brain spinal nerves correct answers 31 pairs emerge from the spinal cord ganglia correct answers small masses of nerve tissue, consisting primarily of neuron cell bodies, located outside the CNS enteric plexuses correct answers extensive networks of neurons located in the walls of organs of the GI tract. The neurons of these plexuses help to regulate the GI tract. two main divisions of nervous system correct answers Central Nervous System: brain and spinal cord; Peripheral Nervous System: everything else. (includes nerves, sensory receptors, ganglia, and enteric plexuses sensory receptor correct answers a structure of the nervous system that monitors changes in the external/internal environment. ex: photoreceptors in eye Sensory Function of the nervous system correct answers Sensory receptors detect internal and external stimuli (rise in blood pressure, rain drop falling on arm), the signal is sent to the brain or spinal cord via cranial or spinal nerves Integrative Function correct answers nervous system processes sensory information by analyzing it and making decisions for appropriate responses ("integration") Motor Function correct answers once sensory information is integrated, the nervous system may elicit an appropriate motor response by activating effectors (muscles and glands) through cranial and spinal nerves. Effector correct answers muscles or glands that when stimulated cause muscle contraction or glandular secretion nissl bodies correct answers clumps of free ribosomes and prominent clusters of RER in the cell body (give grey appearance) multipolar neuron correct answers usually have several dentrites and one axon. Most neurons in the brain and spinal cord are of this type, as well as all motor neurons bipolar neuron correct answers have one main dentrite and one axon. They are found in the retina of the eye, the inner ear, and the olfactory area of the brain