PHYL 2041 Lecture 4: Human Neurophysiology - Lecture 4
23 Oct 2018
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22 multiple choice q"s for this section: nervous system, cns: Efferent (motor) division: efferent division of pns, somatic nervous system (sns): Highlighted in red in the figure, it provides voluntary control over the skeletal muscles. The neurons in this system cause muscle contraction and further controls body movements: autonomic nervous system (ans): Involuntary control of visceral organs via smooth muscles, cardiac muscles and glands: comparisons between somatic and autonomic nervous systems: Ach/nachr; postganglionic neuron: ach/machr and norepinephrine/alpha1, alpha2, beta1, and beta2. For the post ganglionic, they either release acetylcholine or norepinephrine. They activate the acetylcholine or norepinephrine receptors expressed in the muscles or glands: autonomic nervous system: Most of the organs are innervated by both divisions: sympathetic: fight or flight . When under stress, this division is activated mobilize body and respond to different stress conditions. Fear, difficult exam, burning house, or an attacker: parasympathetic: rest and digest .
