BIOL 1051H Chapter Notes - Chapter 12: Choline, Electrophysiology, Blood Sugar
26 Mar 2018
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Simplest organizational level- the nerve cells (neurons) and cells called neuroglia that support their function in various ways. A nervous system receives information about changes in body and external environment and transmits messages to cns. Cns processes this info and determines a response. Cns issues primarily to muscle and gland cells to carry out such responses. Pns is divided into sensory and motor divisions, which are each further divided into somatic and visceral subdivisions: sensory division (afferent) carries signals from various receptors (sense organs and simple sensory nerve endings) to the cns. Cells a(cid:374)d orga(cid:374)s that respo(cid:374)d to these sig(cid:374)als are called effectors: the somatic motor division carries signals to the skeletal muscles. This produces voluntary muscle contractions as well as involuntary somatic reflexes: the visceral motor division (autonomic nervous system, ans) carries signals to glands, cardiac muscle, and smooth muscle.
