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17 Cards in this Set
- Front
- Back
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What is the function of the ANS?
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to control involuntary body functions that we are unconscious of
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what systems are controlled by the ANS?
what spcf types of muscle/tissue? |
Cardiovascular
Respiratory Reproductive Digestion Cardiac, Smooth, and Glands |
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What is the Efferent Nervous System broken down into?
What is each branch responsible for? |
-Somatic Nervous System - Motor and Voluntary control
-Autonomic Nervous System - Visceral and Involuntary control |
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what are the 2 branches of the ANS?
where does each originate? |
Sympathetic SNS - nerves come from the thoracolumbar region of spine
Parasympthatetic PNS - nerves come from the cervical/saccral regions of spine. |
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what is the fiber system of the SNS like?
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Short, Cholinergic pre-ganglionic fibers originate from thoracolumbar regions, synapse w/ cell body in the CHAIN GANGlion.
Long, adrenergic post-ganglionic fibers go to organ they innervate. |
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What does "cholinergic" and "adrenergic" mean?
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cholinergic means it releases Acetylcholine
Adrenergic means it releases norepinephrine. |
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what is the adrenal medulla?
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a gland that secretes epinephrine and norepinephrine; is stimulated by PRE-GANGLIONIC fibers from the SNS, therefore it is a MODIFIED GANGLION.
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Do all sympathetic preganglionic fibers go to the sympathetic chain ganglion?
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no; some go to the adrenal medulla, and some go to COLLATERAL ganglia
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what are the fibers of the PNS like?
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LONG, cholinergic pre-ganglionic fibers originate from brain and saccral spine, synapse with ganglia near or in the stimulated organ. Short, cholinergic post-ganglionic fibers don't have far to go.
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what does the NT from cholinergic pre-ganglionic fibers bind to on the post-ganglionic neuron?
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NT = acetylcholine
Binds to Nicotinic receptors |
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In the SNS, the nicotinic receptors for AcH are on what type of post-ganglionic neuron?
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an Adrenergic - releases norepinephrine.
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What does the NT from the Adrenergic neuron in the SNS bind to?
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alpha or beta adrenergic receptors on the effector organ.
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What does the AcH released by post-ganglionic fibers of the PNS bind to?
What type of effect is seen? |
Muscarinic receptors on the effector organ.
sometimes excitatory, sometimes inhibitory. |
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Are organs that are controlled by the ANS innervated by only the SNS vs. PNS, or both?
what's this concept called? |
both. Dual innervation
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what are 2 things that are NOT dual innervated? What are they innervated by?
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Artioles/veins, and Sweat glands. these are only SYMPATHETIC
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where and what is the adrenalla medulla?
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the inside of the adrenal gland that sits on top of the kidneys.
it is a modified ganglion that secretes epinephrine and norepinephrine. |
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the adrenal gland releases NT:
-what kind/category? -what are they more properly called? |
Catecholamines - Epineph, Norepi, Dopamine
More properly: HORMONES - circulate via the bloodstream. |
