BIO271H1 Lecture Notes - Lecture 1: Potassium Channel, Autonomic Nervous System, Axon Hillock

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8 Mar 2016
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Lecture 1 (january 13, 2016): structure and function of neurons, resting. Basal tone (somatic: low level of activity maintained at all times, rapid efficient response. Neurons are a type of excitable cell, but they can also send signal over long distances due to the action potential. From the pns to the cns is an afferent pathway. Efferent signal is sent to an organ to do the response. Autonomic nervous system = involuntary: regulates every system and organ in the body. Effectors respond to the stimulus usually by homeostasis, bringing stimulus back to set point. Glia make 90% of the brain cells. Bone skull and tebral column protects the cns. Cross section of the spinal cord: butterfly shape, dorsal horn = afferent pathway, ventral horn = efferent pathway, afferent may synapse directly to the efferent neurons, but in most cast, they connect to interneurons. Nervous system and endocrine system are responsible for homeostasis.

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