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Impulses carried to the heart by means of fibers that secrete acetylcholine are what?
Wiki User
∙ 13y ago
parasympathetic impulses and cause the heart rate to decrease
Wiki User
∙ 13y ago
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Explain the source of signals detected by the electromyogram electrodes?
muscle fibers produce and conduct their own impulses and their conducting of impulses result in voltage differences that can be detected by electrodes.
How do you remove fire blanket fibers out of clothes?
How do your remove fire blanket fibers out of clothes
Why does native DNA precipitate as fibers?
Native DNA precipitates as fibers when alcohol is added to a solution containing DNA. The DNA fibers can then be spooled onto a glass rod.
What are insoluble fibers?
insoluble fibers can not be broken down by bacteria in the large intestine and doesnt dissolve in water.
What substances are used to make nylon fibers?
Substances used in making nylon fibers come from petroleum based chemicals or petrochemicals. Different chemical compounds are used to produce different fibers.
Postganglionic axons secrete acetylcholine cholinergic fibers?
Parasympathetic
What do Cholinergic fibers secrete?
Acetylcholine (Ach), which causes sweat production
What stimulates the adrenal medulla to secrete its excitatory hormones?
preganglionic sympathetic fibers releasing acetylcholine that bind to receptors on the adrenal medulla
What are norepinephrine releasing fibers called?
Andrenergic fibers release Norepinephrine and Cholinergic fibers release Acetylcholine.
What secretes norepinephrine adrenergic fibers?
sympathetic division. Parasympathetic division fibers called cholinergic fibers release acetylcholine.
What carries impulses from the cns to the effectors?
Eletrical impulses throughout the nervous system
What do fibroblasts secrete?
proteins for connective fibers
What carries cardiac impulses to the myocardium?
Purkinje Fibers
What is the name of the fibers that carry cardiac impulses from the interventricular septum into the myocardium?
Purkinje fibers
Does a nerve provided impulses for many muscle fibers or just few?
A nerve can stimulate impulses to several muscle fibers. When muscle fibers are grouped they form a single muscle group like the biceps.
Why does acetylcholine causes vaso-dilation?
In some muscle tissue acetylcholine causes vaso-dilation, but not all. Norepinephrine is the opposite competor/effector of acetylcholine. Acetylcholine is present in all preganglionic fibers, both parasympathetic and sympathetic. Acetylcholine is present in postganglionic parasympatic fibers, where norepinephrine is present in the postganglionic sympathetic fibers. In some tissues acetylcholine causes constriction. Can also reduce heart rate vi the vagus nerve. Acetylcholine is the only neurotransmitter used in the somatic nervous system! Acetylcholine can effect vasodilation by several mechanisms, including activation of endothelial nitric oxide (NO) synthase and prostaglandin (PG) production. In human skin, exogenous Acetylcholine increases both skin blood flow and bioavailable NO levels, but the relative increase is much greater in skin blood flow than NO. So this may lead us to speculate that acetylcholine may dilate cutaneous blood vessels through PGs, as well as NO. In some muscle tissue acetylcholine causes vaso-dilation, but not all. Norepinephrine is the opposite competor/effector of acetylcholine. Acetylcholine is present in all preganglionic fibers, both parasympathetic and sympathetic. Acetylcholine is present in postganglionic parasympatic fibers, where norepinephrine is present in the postganglionic sympathetic fibers. In some tissues acetylcholine causes constriction. Can also reduce heart rate vi the vagus nerve. Acetylcholine is the only neurotransmitter used in the somatic nervous system! Acetylcholine can effect vasodilation by several mechanisms, including activation of endothelial nitric oxide (NO) synthase and prostaglandin (PG) production. In human skin, exogenous Acetylcholine increases both skin blood flow and bioavailable NO levels, but the relative increase is much greater in skin blood flow than NO. So this may lead us to speculate that acetylcholine may dilate cutaneous blood vessels through PGs, as well as NO.
Muscle fibers contract and relax in response to what?
nerve impulses
