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Because they are less sensitive to small decreases in arterial Po2 level.

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What mechanism would detect that not enough oxygen is available for normal activity?

Chemoreceptors in the body, specifically central chemoreceptors in the brain and peripheral chemoreceptors in the arteries, can detect changes in blood oxygen levels. When oxygen levels drop below a certain threshold, these receptors send signals to the brain to increase respiratory rate and depth to bring in more oxygen.


Where does respiratory rhythm originate?

For most normal individuals the hypothalmus is is the origin of central chemoreceptors. These chemoreceptors are very sinsitive to elevation or drops in pH (or amount of free Hydrogen Ion in the blood). The equation: H + HCO2 = H2O + CO2 Shows how CO2 in the bloodstreem effects the amount of free H ion in the blood; in other word the more CO2 in the blood the more acidic it is and has a lower pH. The lower the pH of the blood is the more stimulation is given to the central chemoreceptors in the hypothalmus thus stimulating the phrenic nerve among others to raise the respiratory rate and blow off the excess CO2. This process is very different for individuals who are suffering from chronic CO2 retention (Like in COPD). These indeviduals can not use the central chemoreceptors due to the excessive CO2 in the blood is a norm for them! These individuals must now depend on their peripheral chemoreceptor located through out their body. These peripheral chemoreceptors are sensitive to O2 levels in the blood, and are sitmulated by a drop in O2 concentration. This is why it could be dangerous to give excessive supplimental oxygen to a person with COPD. If there is no drop in O2 levels (because your giving them O2) in their blood what stimulates them to breath? Nothing !!!!! Scary huh? Dont smoke!!!


How does the body perceive a drop in pH due to activity?

Chemoreceptors in the internal carotid artery, and so you hyperventilate to lower the pH


What test can be used to detect substance of emulsion?

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If the system resources drop below the system will crash.


How do plants detect seasonal changing?

Plants detect seasonal changes by temperature and day length.Plants detect seasonal changes by the amount of day light.


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What interesting do shark do?

Their sense of smell is so acute that they can detect a drop of blood dissolved in over one million gallons of water! And they can hear can detect a struggling fish over two kilometres away.


What unique feature of a jumping spider can be seen in a dew drop hat?

The unique feature of a jumping spider that can be seen in a dew drop hat is its ability to use the reflective surface of the dew drop to enhance its vision and detect prey more effectively.


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How far below sea level does a submarine drop?

2 m