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When a preganglionic neuron innervates several postganglionic neurons it is called what?
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When several neurons are stimulated equally which one will fire first?
The neuron with the lowest threshold potential will fire first when several neurons are stimulated equally. Threshold potential is the minimum level of depolarization needed to trigger an action potential in a neuron. Neurons with lower threshold potentials are more excitable and will fire before neurons with higher threshold potentials.
A bundle of neurons form at?
A bundle of neurons forms at the intersection of axons and dendrites, where they communicate through electrical and chemical signals. This network allows for the transmission of information throughout the brain and nervous system, enabling various functions such as memory, thought, and movement.
What functional advantages a neuron with several have over a neuron with only one dendrite?
These are also called multipolar neurons and they allow for the integration of a great deal of information from other neurons.
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.
In addition to the nucleus cytoplasm and cell membrane a single neuron possesses what?
A single neuron also possesses dendrites, which receive signals from other neurons, and an axon, which transmits signals to other neurons or cells. Additionally, neurons have synaptic connections that allow them to communicate with other neurons or cells through neurotransmitters.
What is an adrenoreceptor?
An adrenoreceptor is an adrenergic receptor, any of several sites in the surface membranes of cells innervated by adrenergic neurons.
What is an adrenergic receptor?
An adrenergic receptor is any of several sites in the surface membranes of cells innervated by adrenergic neurons.
What are the two main cells of the brain?
Generally, these would be the neurons and the supportive cells. Supportive cells, however, comprise several different kinds of cells. These include oligodendrocytes, glial cells, schwann cells, astrocytes, etc.
What is a bundle of neurons held together by several layers of connective tissue?
A bundle of neurons held together by several layers of connective tissue is called a nerve. Nerves transmit signals between the brain, spinal cord, and various parts of the body, allowing for communication and coordination of bodily functions.
When nerve impulses from several presynaptic neurons stimulate a single postsynaptic neuron at the same time it is called?
chemical synapse
How does the nerve signal move through the neuron?
in transmitting a nerve signal such as from your hand to your brain, several neurons are involved. Nerve cells can receive and transmit signals.the dendrites of one neuron are close to the axon of another neuron. The point where neurons meet is called a synapse
Hypothalamus is composed of what?
The hypothalamus is composed of several nuclei, which are groups of neurons with similar structure and function. These nuclei are involved in regulating processes such as body temperature, thirst, hunger, and hormone release through its connections with the pituitary gland.
