Regulating breathing requires feedback information

When breathing changes or when metabolism changes, it alters the PO2 and the PCO2 in the blood. We should therefore expect the blood levels of one or both of these gases to provide feedback information to the breathing rhythm generator in the medulla. Experiments in which subjects breathe air with different PO2 and PCO2 concentrations lead us to conclude that humans (and other mammals) are remarkably insensitive to falling blood levels of O2, but very sensitive to increases in the PCO2 of the blood (Figure 48.16).

We may ask whether it is a rise in the PCO2 of the blood that stimulates increased breathing when we exercise. To answer this question, researchers ran dogs on treadmills at different speeds. As the speed

Was this article helpful?

0 0
How To Keep Your Treadmill Running

How To Keep Your Treadmill Running

Buying a treadmill is hard enough. Choosing the best out of many treadmills in the market is nigh impossible. But once youve got the treadmill youve always wanted, are your worries truly over? Well, they certainly are, but only if you maintain your treadmill properly.

Get My Free Ebook


Post a comment