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A 78 year-old man gets up too quickly from his Lazyboy and nearly falls to the...

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Medical Sciences

A 78 year-old man gets up too quickly from his Lazyboy andnearly falls to the floor after experiencing light-headedness, butluckily falls backward into the chair.

a. Briefly, what are the essential components of a visceralreflex?

b. What is the cardiovascular response to this drop in bloodpressure?

c. What location in the central nervous system coordinates thisresponse?

Answer & Explanation Solved by verified expert
3.7 Ratings (535 Votes)
A the visceral reflex components are1 sensory receptor2 sensory neuron3 integration center4 Efferent pathway5 effector targetB the entire vasoconstrictor and cardioaccelerator functions ofthe sympathetic nervous system are stimulated together At the sametime there is reciprocal inhibition of parasympathetic vagalinhibitory signals to the heart Thus three major changes occursimultaneously each of which helps to increase arterial pressureThey are as follows1 Most arterioles of the systemic circulation are constrictedThis greatly increases the total peripheral resistance therebyincreasing the arterial pressure2 The veins especially but the other    See Answer
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