A drug is known to decrease heart rate. After cutting the white ramiof T1–T4, the drug still causes the heart rate to decline. After cuttingthe vagus nerves, the drug no longer affects heart rate. Which divisionof the ANS does the drug affect? Does the drug affect the synapsebetween preganglionic and postganglionic neurons, the synapse betweenpostganglionic neurons and effectors, or the CNS? Is the drug’s effectexcitatory or inhibitory?
A drug is known to decrease heart rate. After cutting the white ramiof T1–T4, the drug still causes the heart rate to decline. After cuttingthe vagus nerves, the drug no longer affects heart rate. Which divisionof the ANS does the drug affect? Does the drug affect the synapsebetween preganglionic and postganglionic neurons, the synapse betweenpostganglionic neurons and effectors, or the CNS? Is the drug’s effectexcitatory or inhibitory?
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question
A drug is known to decrease heart rate. After cutting the white rami
of T1–T4, the drug still causes the heart rate to decline. After cutting
the vagus nerves, the drug no longer affects heart rate. Which division
of the ANS does the drug affect? Does the drug affect the synapse
between preganglionic and postganglionic neurons, the synapse between
postganglionic neurons and effectors, or the CNS? Is the drug’s effect
excitatory or inhibitory?
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