Which of the following will the medulla signal to occur in the presence of respi
ID: 3482624 • Letter: W
Question
Which of the following will the medulla signal to occur in the presence of respiratory acidosis? Mark all correct or incorrect.
Increase in respiratory rate
Recruitment of inspiratory and expiratory accessory muscles
Increased strength of diaphragmatic contraction
Lengthening of the period between breaths to allow more time for exhalation of carbon dioxide
correct
incorrect
Increase in respiratory rate
Recruitment of inspiratory and expiratory accessory muscles
Increased strength of diaphragmatic contraction
Lengthening of the period between breaths to allow more time for exhalation of carbon dioxide
A.correct
B.incorrect
Explanation / Answer
In respiratory acidosis, H2CO3 levels are raised. pCO2 is raised. It is expelled in the form of CO2 through lungs.
To do this, respiratory rate increases.
In acidosis, the respiratory drive for increased pulmonary ventilation causes the medulla to stimulate accessory inspiratory and expiratory (VRG) muscles.
Increased inspiratory 'Ramp' signal causes increased strength of diagrammatic contraction.
The pneumotaxic center transmits more signals, which act as switch-off point of inspiration, which reduces the length of respiratory cycle, but increases the respiratory rate, thus facilitating greater CO2 removal.
So, the first three statements are correct. The last statement is incorrect.
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