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What are the 3 things that sympathetic preganglionic axon reaches a trunk ganglion?
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How does sympathetic nervous system affect the iris?
The sympathetic nervous system is one of three major parts of the autonomic system. The autonomic nervous system (ANS) is the part of the nervous system that controls most of the things we don't do voluntarily. Things such as heart rate, respiratory rate, sexual arousal and tone of the muscle inside your eye (the iris). The sympathetic part of the ANS is often considered to promote a "fight or flight response" while the parasympathetic part does the opposite ("rest and digest"). If we think about a dangerous situation where you want to have a "fight or flight response", you generally want to have more light entering your eyes so that you have a heightened visual sense. This is accomplished when your sympathetic nervous system activates the radial muscles of your iris. In contrast, your constricter muscles are relaxed. This leads to dilated pupils forming part of the sympathetic response.
How does a nerve cells work?
the axon terminal button receives stimuli and passes it on to ither cells or it reaches the dedrites which are buried in your spine, travelles up the spine and reaches the brain, which is how you feel pain and things like that.
Would the sympathetic nervous system cause your heart to beat faster when you are under stress?
The answer is "yes." The sympathetic nervous system stimulates responses to strong feeling/emotion (as well as having other "jobs"). So it will cause your heart to beat faster and other "fight or flight" reactions in response to such things as terror, hate, lust and so-on....
What causes the Sun's light and heat energy that reaches earth?
Among other things - your existence.
Is the amoeba bad for us?
The amoeba is a parasite: an organism which feeds on other living things. Therefore yes, the amoeba does harm to us if by any means it reaches our body.
Why are sympathetic responses generally widespread?
Sympathetic responses are more widespread because of the way the efferent nerves (from spinal cord outward) are positioned. The autonomic system has two neurons between its spinal cord and the organ that it is modulating whereas the somatic system has only one. The difference between the sympathetic and the parasympathetic is that in the case of sympathetic, the first nerve out of the spinal cord, called the preganglionic fiber is extremely short and ends relatively close to the spinal cord. Here, the preganglionic fiber synapses with on average of 10 postganglionic fibers which then moves onto effect a variety of different organs. On the other hand, in the parasympathetic division the preganglionic nerve are extremely long and extends until it is almost at the organ. From there, it synapses with a very short post-synaptic nerve that then synapses an organ. The ratio in this case can be about 1:3 but usually is 1:1. To sum things up, in the sympathetic division, the preganglionic fiber terminates very early and therefore has the "opportunity" to interact with a variety of nerves. On the other hand, the parasympathetic division has such a long preganglionic fiber that by the time it synapses its post ganglionic fiber, it is pretty much at the organ. NE and epinephrine are secreted into the blood as part of the sympathetic response.
Do the white communicating rami contain myelinated preganglionic sympathetic nerve fibers and are present in all apinal nerves?
Yes and No. White communicating rami contain mylinated preganglionic sympathetic nerve fibers, but are only present at the levels of spinal cord segments T1-L2 (where the cell bodies for these nerve fibers exist in the lateral horn of the spinal cord). Although the sympathetic fibers only arise in the T1-L2 spinal cord segments, they are dispersed to all spinal nerves by traveling through the sympathetic chain. The preganglionic sympathetic fibers will enter the sympathetic chain thru whit rami communicans and then do one of 4 things: 1. synapse with a postganglionic cell body in the sympathetic chain at the level it enters 2. ascend within the chain to synapse 3. descend within the chain to synapse 4. splanchnic nerves leave the chain without synapsing and synapse closer to the organ they innervate.There are, however, GRAY rami communicans for all spinal nerves.I hope that helps
What causes a brainfreeze?
When things touch the roof of your mouth, they acitivate a particular nerve or a bunch of them, in the sphenopalatine ganglion (sometimes known as pterygopalatine ganglion).
The division of the autonomic nervous system that acts in times of emergency is the?
The sympathetic nervous system is the "fight or flight" part -- in times of stress, it is what kicks in to get things handled. Once the danger is removed (or stress), the parasympathetic kicks in, which calms you down.
Which part of the brain controls The cardiac and respiratory centers for the body?
Lots of areas of the nervous system are. The brainstem (medulla) helps control heart rate, but the heartbeat itself doesn't depend on the nervous system at all.Autonomic nervous system controls circulation by acting on muscles that surround arteries, and smaller vessels.One of the things that influences which capillaries are open is body temperature, which is controlled in a part of the brain called the hypothalamus.
What affect the amount and rate the alcohol reaches the bloodstream?
Some of the things that affects the rate the alcohol reaches the blood stream are your weight, gender, size of the drink, time spent drinking, and food.
If you are trying to preserve your product so it reaches the stores without spoiling what are some things you could do?
Freeze it.
What 3 things happen to the air you breathe before it reaches the alveoli?
Warm the air, Moisten, and filter of debris.
How does sympathetic nervous system affect the iris?
The sympathetic nervous system is one of three major parts of the autonomic system. The autonomic nervous system (ANS) is the part of the nervous system that controls most of the things we don't do voluntarily. Things such as heart rate, respiratory rate, sexual arousal and tone of the muscle inside your eye (the iris). The sympathetic part of the ANS is often considered to promote a "fight or flight response" while the parasympathetic part does the opposite ("rest and digest"). If we think about a dangerous situation where you want to have a "fight or flight response", you generally want to have more light entering your eyes so that you have a heightened visual sense. This is accomplished when your sympathetic nervous system activates the radial muscles of your iris. In contrast, your constricter muscles are relaxed. This leads to dilated pupils forming part of the sympathetic response.
What are 7 things that will increase the heart rate?
There are really only two ways to increase heart rate: 1) increased cardiac (venous) return - usually due to exercise. 2) the sympathetic nervous system. It is possible to subdivide the sympathetic response, (fear, embarrassment, etc) but that's just artificial.
How does a nerve cells work?
the axon terminal button receives stimuli and passes it on to ither cells or it reaches the dedrites which are buried in your spine, travelles up the spine and reaches the brain, which is how you feel pain and things like that.
Anterior root of the spinal cord is composed of?
The anterior root is composed of nerve fibers responsible for motor activity (i.e. efferent nerve fibers that will stimulate muscles, etc.). I think some of the things it is composed of include:Gamma motor neurons, alpha motor neurons, preganglionic autonomic neurons
