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13 Cards in this Set
- Front
- Back
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ANS
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innervates all effector organ except skeletal muscle cells.
involuntary control system Subdivided into : Parasympathetic Sympathetic Most organs are innervated by BOTH subdivisions Tend to act in opposition to one another. Tend to be active under different conditions Primary goal of ANS is to maintain homeostasis during activity, SNS dominates control. |
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Autonomic neurotransmitters & receptors
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2 receptors secreted by a target cell
PNS - Ach (acetylycholine) SNS - NE Cells that secrete Ach - cholenergic Cells that secrete NE - adrenergic |
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PNS
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____ - Ach (acetylycholine)
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NE
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SNS - ___
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cholenergic
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Cells that secrete Ach - ___________
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adrenergic
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Cells that secrete NE - ___________
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neurotransmitters
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receptor type determines which _____________ will act on target cells.
cholinergic - respond to Ach adrenergic - respond to NE |
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Cholenergic receptors
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2 subclasses
Nicotinic Muscarinic |
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Nicotinic
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receptor that is found on postganglionic dendrites and cell bodies, in the adrenal medulla, on skeletal muscle cells, and recently have been found in small regions of the CNS.
receptor act to open Na+ or K+ channels |
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Muscarinic
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found on effector organs controlled by the PNS
receptors act as part of a G protein system to open or close ion channels. |
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Adrenergic receptors
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2 subclasses located on target cells
alpha beta |
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Alpha receptors
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Activate or inhibit 2nd messengers
May act to DECREASE cAMP activity Can be effected by both NE and E from adrenal medulla. |
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Beta receptors
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Act on G proteins systems to INCREASE cAMP activity.
Can be activated by both NE and E. |
