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Physiology

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Respiration

Question
14 out of 33
 

In moderate exercise stimulation of respiration is due to (DNB June-2008)



A Stimulation of J Receptor

B Stimulation of lung stretch receptor

C Joint propioception receptor

D Stimulation of medullary centre.

Ans. C Joint propioception receptor

Effects of exercise on Respiration:-

1. There is an abrupt increase in the ventilation, at the start of the exercise is presumply due to psychic stimuli and afferent impulses from propioceptors in muscles, tendons, and joints; with moderate exercise, the increase is due mostly to an increase in the depth of respiration.

2. The more gradual increase is presumbly humoral even though arterial pH, PCO2 and PO2 remain constant during Moderate exercise.

3. It currently appears that a no. of different factors combine to produce the increase in ventilation seen during moderate exercise for ego body temp. plasms K+cone that stimulate peripheral chemoreceptor, sensitivity of Respiratory centre to CO2.

4. During severe exercise →↑ in ventilation is due to →↑Lactic acid, pH Q (H+) and CO2

J-receptor (Juxtacapillary) they are C-fibers ending (unmyelinated Q) close to pulmonary vessels stimulated by: Hyper inflation of lungs, when pulmonary capillaries are engorged with blood or pulmonary edema (as in CCF) or IV/Intracardiac capsaicin The reflex response (pulmonary chemoreflex) that is produced in Apnea_followed by rapid breathing (tachypnea), brady cardia and Hypotension.

Respiration Flashcard List

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