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What is unopposed sympathetic activity?
Unopposed sympathetic activity is when the sympathetic nervous system is overly stimulated without a counterbalancing effect from the parasympathetic nervous system. It can lead to symptoms such as rapid heart rate, high blood pressure, sweating, and feelings of anxiety or agitation. This imbalance can occur in conditions like panic attacks or certain drug overdoses.
What is Parasympathetic effect of pupil?
The parasympathetic effect on the pupil involves constriction, known as miosis. This occurs when the parasympathetic nervous system is activated, typically through the release of the neurotransmitter acetylcholine, which acts on the circular muscles of the iris. This constriction helps regulate the amount of light entering the eye and is part of the body's rest-and-digest response. In contrast, the sympathetic nervous system causes pupil dilation (mydriasis) in response to stress or excitement.
Does coronary vessels have both parasympathetic and sympathetic innervation?
Yes, coronary vessels have both parasympathetic and sympathetic innervation. Parasympathetic input leads to vasodilation of coronary vessels, while sympathetic input can cause vasoconstriction in response to stress or exercise. The balance between these two systems helps regulate blood flow to the heart.
Would The parasympathetic nervous system control and allow for active diuresis?
Parasympathetic stimulation stimulates the muscarinic receptors (and nicotinic) leading to increased Salivation, Lacrimation, Urination, Defacation, increased Gastric motility, Emesis etc Baroreceptors detect increased BP (vessel stretch) and increase vagal tone - > increase parasympathetic tone ->increase muscarinic stimualtion - > diuresis Also consider the effect of Atrial Natruetic Peptide and its effect...
In what way do the parasympathetic and the sympatheticnervous systems work together?
Yes. The vagus nerve is a parasympathetic nerve that is almost always stimulating the healthy heart to have a heart rate less than the inherent rate of the SA node. The sympathetic innervation on the heart is minimal and only important during exercise.
Why sympathetic nervous system has generalized effect while parasympathetic nervous system has localized effect?
the ratio of a preganglionic neuron to
What is the parasympathetic and Sympathetic effect on the stomach?
The parasympathetic is stimulatory to stomach , increase the gastric secretion and motility while the sympathetic is inhibitory , decrease the gastric secretion and motility
What is the sympathetic effect on the heart?
Heart rate increases with sympathetic nervous system. There is increase in stroke volume and cardiac output. With stimulation of vagus nerve or parasympathetic nervous system, You have decrease in heart rate. There is decrease the stroke volume and cardiac output.
What is unopposed sympathetic activity?
Unopposed sympathetic activity is when the sympathetic nervous system is overly stimulated without a counterbalancing effect from the parasympathetic nervous system. It can lead to symptoms such as rapid heart rate, high blood pressure, sweating, and feelings of anxiety or agitation. This imbalance can occur in conditions like panic attacks or certain drug overdoses.
What is Parasympathetic effect of pupil?
The parasympathetic effect on the pupil involves constriction, known as miosis. This occurs when the parasympathetic nervous system is activated, typically through the release of the neurotransmitter acetylcholine, which acts on the circular muscles of the iris. This constriction helps regulate the amount of light entering the eye and is part of the body's rest-and-digest response. In contrast, the sympathetic nervous system causes pupil dilation (mydriasis) in response to stress or excitement.
Are most innervated blood vessels receive only sympathetic nerve fibers?
No, most blood vessels are innervated by both sympathetic and parasympathetic nerve fibers. However, sympathetic nerve fibers typically have a more pronounced effect on blood vessel activity compared to parasympathetic fibers.
Does coronary vessels have both parasympathetic and sympathetic innervation?
Yes, coronary vessels have both parasympathetic and sympathetic innervation. Parasympathetic input leads to vasodilation of coronary vessels, while sympathetic input can cause vasoconstriction in response to stress or exercise. The balance between these two systems helps regulate blood flow to the heart.
Explain the difference between sympathetic and parasympathetic reactions as they occur in the autonomic nervous system?
The sympathetic nervous system is most active when you are in an emergency, exercising, or an exciting or embarrassing situation. It is often referred to as the "fight-or-flight" system. It increases the heart rate, blood pressure, and blood glucose levels. It also dilates the bronchioles of the lungs, and dilates the blood vessels of the skeletal muscles. This nervous system enables the body to cope rapidly with situations. The parasympathetic nervous system is active when the body is resting. It is referred to as the "resting-and-digesting" system. It conserves your body's energy by slowing the heart rate. It also promotes digestion.sypmathetic is the "fight or flight" response and the parasympathetic is the "rest and digest" responses
What has the author Naeema C Degani written?
Naeema C. Degani has written: 'Effect of ethanol on the sympathetic nervous system' -- subject(s): Physiological effect, Sympathetic nervous system, Alcohol, Alcohol in the body
What effect would a drug that blocks the parasympathetic nervous system have on peristalsis in the GIT?
increase motility
What nervous system regulates the blood?
A good example is the baroreflex. Pressure sensors signal to the nervous system to increase venous return when we go from lying to standing. The nervous system controls the contraction of the veins which forces blood from the legs back to the heart. The nervous system can also increase the stimulation to the heart increasing the number of beats per minute. The net effect of the blood that is returned into the circulation and the increases heart rate act to restore blood pressure to it's proper level.
What effect does the sympathetic and parasympathetic nervous system have on the digestive system?
The parasympathetic nervous system is a division of the autonomic nervous system (along with the sympathetic nervous system, and the enteric nervous system). In simple terms, the SNS can be thought of as the body's gas pedal, and the PNS as the brake. So where the SNS deals with 'fight or flight' the PNS deals with 'rest and digest'. In other words, the PNS is often inhibitory. For example, it can act to slow down heart rate, enhance the peristaltic contractions of the gut, or increase secretions of digestive enzymes. In can also cause vasodilation (make the blood vessels wider) around your gut after meals: this means more blood flows to your intestive and stomach after you've eaten a meal, allowing you to digest what you've eaten.
