BIOL121 Lecture Notes - Lecture 11: Parasympathetic Nervous System, Adrenal Gland, Propranolol
22 Aug 2018
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Controlled by the hypothalamus and medulla oblongata. Sensory (afferent: for input sensing. Motor (efferent: for effect doing. Sympathetic division: widespread impact reaches organs and tissues throughout the body. Parasympathetic division: innervates only specific visceral structures. Most organs receive instructions from both divisions: dual innervation. Most often, these two divisions have opposing effects; they maintain balance. The two divisions may also work independently. The two divisions may work together, with each controlling one stage of a complex process. Mobilises the body during activity; is the. Promotes adjustments during exercise, or when threatened. Promotes maintenance activities and conserves body energy; rest and digest . Its activity is illustrated in a person who relaxes, reading, after a meal. First neuron = preganglionic fibre: cell body in the cns, axon (fibre) goes out of the pns, at ganglion meets second cell body. Second neuron = postganglionic fibre: cell body in the pns, axon (fibre) goes to the effector; such as the muscle or gland.
