Vasovagal syncope is the most common form of fainting in young adults, particula

Question

Vasovagal syncope is the most common form of fainting in young adults, particularaly ages 13-15, with no totally obvious triggers. In young adults, theres a much bigger change in blood supply to skeletal muscles even with little changes in activity, and the rest of the circulatory system may be slow to respond. This particularly is relevant given normal reflex response of the baroreceptors to standing, and the resultant drop in blood pressure is called orthostatic hypotension.    What stimualtets the demanf for blood by skeletal muscle activity? How does this change the blood distribution from resetng conditions? What effect might this have on blood pressure and flow to the brain, and how is this change normally regulated? Given what you know about parasympathetic vagus nerve, how might Doug's hunger be related to the fainting episode?

Explanation / Answer

Ques-1: What stimualtets the demand for blood by skeletal muscle activity?

Higher oxygen demand for muscular activity due to high skeletal muscle activity is mainly responsible for the high demand for blood

Ques-2: How does this change the blood distribution from resetng conditions?

The blood distribution in vasovagal syncope is mainly from supine resting conditions or blood distribution change due to squatted position in teenagers and adolescents. This distribution of blood is reduced due to transient fall in a arterial pressure, if they stand by vasodilation in active skeletal muscle

Ques-3: What effect might this have on blood pressure and flow to the brain, and how is this change normally regulated?

Vasovagal syncope is going to trigger orthostatic hypertension because of higher pooling of venous blood beneath the heat mainly for long periods of standing with no movement & it is also associated with ambient temperatures. Therefore, fainting occurs due to no supply of adequate oxygenated blood to the brain followed by "petitmal seizures" or sudden convulsions. These events are leading to the body to fire off with muscles to twitch very rapidly

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