Anatomy & Physiology: The Unity of Form and Function, 7th Edition

Published by McGraw-Hill Education
ISBN 10: 0073403717
ISBN 13: 978-0-07340-371-7

Chapter 15 - Section 15.3 - Autonomic Effects on Target Organs - Before You Go On - Page 572: 7

Answer

Adrenergic and cholinergic fibers are part of the autonomic nervous system and release different neurotransmitters: 1. **Adrenergic fibers** release the neurotransmitter **norepinephrine** (also known as noradrenaline) at their synaptic terminals. These fibers are typically associated with the sympathetic division of the autonomic nervous system and are involved in the "fight or flight" response. 2. **Cholinergic fibers** release the neurotransmitter **acetylcholine** (ACh) at their synaptic terminals. These fibers can be further divided into two types: - **Nicotinic cholinergic receptors** are found at neuromuscular junctions and in autonomic ganglia. These receptors respond to acetylcholine. - **Muscarinic cholinergic receptors** are found on target cells of the parasympathetic division of the autonomic nervous system and respond to acetylcholine. So, in summary, adrenergic fibers release norepinephrine, while cholinergic fibers release acetylcholine.

Work Step by Step

Adrenergic and cholinergic fibers are part of the autonomic nervous system and release different neurotransmitters: 1. **Adrenergic fibers** release the neurotransmitter **norepinephrine** (also known as noradrenaline) at their synaptic terminals. These fibers are typically associated with the sympathetic division of the autonomic nervous system and are involved in the "fight or flight" response. 2. **Cholinergic fibers** release the neurotransmitter **acetylcholine** (ACh) at their synaptic terminals. These fibers can be further divided into two types: - **Nicotinic cholinergic receptors** are found at neuromuscular junctions and in autonomic ganglia. These receptors respond to acetylcholine. - **Muscarinic cholinergic receptors** are found on target cells of the parasympathetic division of the autonomic nervous system and respond to acetylcholine. So, in summary, adrenergic fibers release norepinephrine, while cholinergic fibers release acetylcholine.
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