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Are most innervated blood vessels receive only sympathetic nerve fibers?
Wiki User
∙ 9y ago
Most of the viscera get nerve supply from both sympathetic and parasympathetic systems.
Wiki User
∙ 9y ago
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What fibers are the sweat glands innervated by?
sympathetic
What secretes norepinephrine adrenergic fibers?
sympathetic division. Parasympathetic division fibers called cholinergic fibers release acetylcholine.
Preganglionic sympathetic fibers trigger the release of?
epinepherine and norepinephrine
When a single neuron sends a strong enough impulse to a muscle that how many muscle fibers does it cause to contract?
This will depend upon the number of muscle fibers the nerve innervates. However, all fibers innervated by the nerve should contract in response to the neuronal impulse.
The canal that runs through the core of each osteon (Haversian system) contains?
Central (Haversian) Canal is the canal that runs through the core of each osteon.
What fibers are the sweat glands innervated by?
sympathetic
Which finger's nerves connect to the heart?
The heart is innervated by parasympathetic and sympathetic fibers.
What parts of the body receive only sympathetic fibers?
adrenal medulla, sweat glands, arrector pili muscles of the skin, kidneys, most blood vessels
What is the relationship between the number of motor neurons recruited and the number of skeletal muscle fibers innervated?
Typically, hundreds of skeletal muscle fibers are innervated by a single motor neuron.Completed
What innervates the heart?
The heart is innervated by vagal and sympathetic fibers. The right vagus nerve primarily innervates the SA node, whereas the left vagus innervates the AV node; however, there can be significant overlap in the anatomical distribution. Atrial muscle is also innervated by vagal efferents, whereas the ventricular myocardium is only sparsely innervated by vagal efferents. Sympathetic efferent nerves are present throughout the atria (especially in the SA node) and ventricles, including the conduction system of the heart.
Do the post-ganglionic sympathetic fibers release acetylcholine?
No, post-ganglionic sympathetic fibers mostly release norepinephrine. But they do release some ACh to the sweat glands, which causes concurrent vasodilation of surrounding blood vessels (paired with release of bradykinin from sweat glands).
What is innervated by postganglionic fibers arising from the cervical ganglia?
the eyes
What part of the body receives sympathetic fibers?
adrenal medulla, sweat glands, arrector pili muscles of the skin, kidneys, most blood vessels
Do the sympathetic fibers leave the CNS at the thoracolumbar region?
All preganglionic sympathetic fibers leave the CNS at the thoracolumbar region, yes.
What fibers innervate sweat glands?
Sympathetic fibers innervate sweat glands.
How can sympathetic and parasympathetic fibers exert antagonistic effects?
Sympathetic fibers convey impulses that stimulate our "fight or flight" response. Parasympathetic are just the opposite, you might say they are for "rest and digest". They are both firing at the same time but depending on your environment and emotional state, one will dominate over the other. Sympathetic and parasympathetic fibers release different neurotransmitters, which bind to different receptors. Three structures that receive sympathetic innervation are the adrenal glands, arrector pilli muscles, and sweat glands.
What fibers are located in the white rami?
Sympathetic preganglionic.
