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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

Case 1

As an individual continues to hyperventilate at high altitudes, the individual's Pa co 2 (______ increases; ___decreases;______ remains the same).

Summary Introduction

To review:

The given blank space in the statement, “As an individual continues to hyperventilate at high altitudes, the individual’s PaCO2(______increases;________ decreases; _________ remains the same).”

Introduction:

When an individual ascends to a high altitude, the peripheral and central chemoreceptors regulate the ventilatory pattern. The barometric pressure and PO2(arterial pressure of oxygen) decrease with an increase in the altitude. The PaO2 falls to 60 mm Hg (millimeters of mercury) with further ascending. This activates the peripheral chemoreceptors, which in turn stimulates the medulla.

Please refer to Clinical Application Case-1 for further information.

Explanation

The stimulation of the medulla leads to increased ventilation. The secondary decrease in the PaCO2(arterial pressure of carbon dioxide) takes place as a consequence of increased ventilation. The individual hyperventilates in response to a further reduction in the levels of PaO2. The individual has to hyperventilate as the peripheral chemoreceptors are not able to adjust to the decreased oxygen concentration

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