Chapter 15 The Autonomic Nervous System 1.pdf - Dual...

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Dual innervation1.most visceral organs are innervated by both sympathetic and parasympathetic fibers2.generally have opposite effects3.can be excitatory or inhibitory depending on the organ innervated4.both systems are usually partially activea. sympathetic or parasympathetic tone, or tonic activity5.when one division increases its rate of sending signals and the other decreases, it's calleddominancea. sympathetic dominance1) increase in blood flow to skeletal muscles (vessels dilate) 2) heart beats faster and more forcefully3) blood pressure increases (most vessels constrict)4) respiratory airways dilate5) stored nutrients are broken down6) digestive and urinary activities are inhibited 7) pupils dilate8) sweatingb. parasympathetic dominance1) inhibits sympathetic activities (e.g., heart rate and blood pressure decrease) 2) normal resting functions
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Summer
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HUTCHINS
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