PNB 2264 Lecture Notes - Lecture 21: Tears, Vasoconstriction, Tachycardia

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Outflow of info form the cns through spinal and cranial nerves. Key to control homeostasis to the body. Auto(cid:374)o(cid:373)ic does(cid:374)"t (cid:373)ea(cid:374) auto(cid:373)atic, it (cid:373)ea(cid:374)s at a(cid:374) u(cid:374)co(cid:374)scious level. Keeps us operating without thinking about it. Unconscious reflex internal homeostasis: negative feedback loops. Separate divisions: parasympathetic, sympathetic inanc, enteric somatic nervous system control skeletal muscle. Ans and sns can be found within the same nerves. Sns (somatic: skeletal muscle, excitatory, 1st neuron from cns and spinal cord motor nuclei, one synapse, myelinated, ach neurotransmitter. Wide range of tissues, excitatory and inhibitory. 1st neuron extends from cns to ganglia: collection of cell bodies outside of cns. Two synapses: 1st neuron and 2nd neuron; 2nd neuron with tissue: preganglionic and postganglionic neurons. Different pre and post ganglionic cell axonal length. 5/6 neurotransmitters used in para and sympathetic neurons. Ps ans: energy conservation, bradycardia, hypotension, increased digestion and absorption of nutrients, and excretion of waste products, slud (salivation, lacrimation, urination and defecation)

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