Parasympathetic stimulation of the hea accompanied by a withdrawal of sympathetic tone to most of the blood vessels of the body is characteristic of
Correct Answer: Vasovagal syncope
Description: The fight-or-flight response and exercise are characterized by the increased sympathetic tone and decreased parasympathetic tone.The diving response is associated with increased parasympathetic and sympathetic tone.The cold pressor response is characterized by increased sympathetic activity to the hea and blood vessels.Emotional Fainting--Vasovagal Syncope: An interesting vasodilatory reaction occurs in people who experience intense emotional disturbances that cause fainting. In this case, the muscle vasodilator system becomes activated and, at the same time, the vagal cardioinhibitory center transmits strong signals to the hea to slow the hea rate markedly. The aerial pressure falls rapidly, which reduces blood flow to the brain and causes the person to lose consciousness. This overall effect is called vasovagal syncope. Emotional fainting begins with disturbing thoughts in the cerebral coex.Ref: Guyton; 13th edition; Chapter 18 Nervous Regulation of the Circulation and Rapid Control of Aerial Pressure
Category:
Physiology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now