Thev nerve fibers sending signals to slow the heart rate of contraftion will most likey belong to
Added by Douglas M.
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The question states that the nerve fibers are sending signals to slow the heart rate. This indicates that these nerve fibers are involved in the regulation of the heart's rhythm. Show more…
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Nerve impulses are sent to slow the heart's rate of contraction. The nerve fibers sending these signals will most likely belong to which division of the nervous system? 1) sensory (afferent) division 2) somatic nervous system 3) sympathetic division 4) parasympathetic division
Rupsa S.
What's the MAIN nerves whose branches release acetylcholine to slow the heart.
Adi S.
The parasympathetic nervous system is also known as the craniosacral division of the ANS. The preganglionic fibers exit the CNS at the brainstem and sacral region of the spinal cord. An example of a parasympathetic pathway is the innervation of the heart. The preganglionic nerve fibers carry action potentials from the brain toward the heart. These fibers pass through the cardiac plexus and end at terminal ganglia, where secretion of the neurotransmitter acetylcholine stimulates an action potential in the postganglionic fiber. Since the postganglionic fibers are long compared to the preganglionic fibers, impulses arrive relatively quickly at the heart tissue. The postganglionic fibers synapsing on cells in the heart release the neurotransmitter acetylcholine. This parasympathetic neurotransmitter causes the heart rate and cardiac contraction to decrease.
Madhur L.
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