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Sympathetic stimulation causes vasoconstriction of the afferent arterioles in the kidneys. This response reduces blood flow into the glomeruli, which can decrease glomerular filtration rate (GFR). The effect is part of the body's mechanism to prioritize blood flow to vital organs during stress or low blood volume situations. Ultimately, this helps conserve water and maintain blood pressure.
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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.
What is the effect of constricted arterioles in the glomerular filtration rate?
Constricted arterioles in the glomerulus can lead to a decrease in the glomerular filtration rate (GFR) by reducing the amount of blood flow entering the glomerulus. This can result in decreased filtration of waste and reduced urine production.
What is the effect of parasympathetic stimulation on respiration?
Parasympathetic stimulation typically decreases respiration rate by promoting relaxation through mechanisms such as reducing sympathetic activity, slowing down the heart rate, and decreasing the depth of inhalation. This allows the body to conserve energy and support activities like digestion and rest.
Does the effect of epinephrine mimic the effect of the sympathetic nervous system or the parasympathetic nervous system?
The effect of epinephrine mimics the effect of the sympathetic nervous system. Epinephrine is also known as adrenaline, and it activates the "fight or flight" responses in the body, such as increasing heart rate, dilating airways, and increasing blood flow to muscles.
Why is it important for the sympathetic nervous system to be able to override the kidney's autoregulatory systems?
If blood pressure drops too low due to excessive fluid loss, then the sympathetic nervous system will override renal autoregulation. Sympathetic nerves innervate the afferent arteriole, causing smooth muscle contraction, decreased GFR and decreased fluid loss via urine. Another effect of the sympathetic nervous system is to stimulate renin secretion by the juxtaglomerular cells, activating the renin-angiotensin-aldosterone system (RAAS). The RAAS increases extracellular fluid volume by increasing sodium reabsorption (see later web page on sodium).
What is the effect of sympathetic stimulation on the rectum?
Sympathetic stimulation causes relaxation of the rectum's smooth muscle, leading to decreased motility and tone. This can result in decreased urgency and the ability to retain feces.
What is the effect on blood pressure to an attack by a mugger?
Blood pressure would increase due to sympathetic nervous system stimulation.
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.
Difference between afferent and efferent in kidney?
Efferent means going away from and afferent is going toward. The afferent arteriole of the kidney carrys blood toward the glomerulus, whereas the efferent arteriole carrys blood away from the glomerulus.
What is the effect of reducing afferent arteriole radius on filtration?
reducing afferent arteriole radius decreases filtration rate
Why does sympathetic stimulation have less effect on blood vessels in the brain than on vessels in the skin?
Sympathetic stimulation has less effect on blood vessels in the brain compared to those in the skin due to the unique regulatory mechanisms in cerebral circulation. The brain has a high degree of autoregulation, allowing it to maintain a constant blood flow despite changes in systemic blood pressure, prioritizing its oxygen and nutrient supply. In contrast, blood vessels in the skin are more responsive to sympathetic stimulation, which helps regulate temperature and blood flow in response to external conditions. This differential response ensures that essential brain functions remain stable even during stress or changes in the body's overall state.
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 the effect of constricted arterioles in the glomerular filtration rate?
Constricted arterioles in the glomerulus can lead to a decrease in the glomerular filtration rate (GFR) by reducing the amount of blood flow entering the glomerulus. This can result in decreased filtration of waste and reduced urine production.
When your pupils dialate does that mean you have a fast heartbeat?
No, although the two may both be signs of sympathetic nervous system stimulation, so often they're seen at the same time, though there is no cause-and-effect relationship.
Whats the function of veins and what are the effect of sympathetic activity on veins?
veins help with sex and the effect of sympathetic activity on veins is that it will help with sex
What is the effect of parasympathetic stimulation on this salivary glands?
Parasympathetic stimulation increases saliva production in the salivary glands by causing the release of acetylcholine, which binds to receptors on the gland cells and triggers the secretion of saliva. This response helps with digestion and keeps the mouth moist.
What is an effect of psychoactive abuse?
stimulation of the reward pathway
