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10 Cards in this Set
- Front
- Back
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What are sensory receptors in the body that are sensitive to chemical composition of body fluids?
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chemoreceptors
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Where are the 2 sets of chemoreceptors that are sensitive to pH?
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medulla oblongata of the brain stem, and also in the carotid bodies (in the neck and aortic bodies in the aorta)
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Why do you inhale?
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Because of plasma acidity directly caused by carbon dioxide
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What are the chemoreceptors stimulated by?
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When the carbon dioxide entering the blood is sufficient to change blood pH.
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What is increased carbon dioxide due to?
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its ability to from free hydrogen ion when acted upon by carbonic anhydrase
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Reduced oxygen levels can cause increased respiration, but how strong is its stimulus?
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relatively weak
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How does the baby take its first breath?
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when the umbilical cord is clamped and cut, the build up of CO2 and the accompanying increase in H+ stimulate the medulla oblongata and the newborn takes its first breath.
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What type of breathers are babies?
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Diaphragmatic breathers, and nose breathers
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What does the respiratory center do when the pH of the blood decreases?
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the respiratory center increases the rate and depth of breathing which causes more carbon dioxide to be removed from the blood and the hydrogen ion concentration to return to normal
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Why are most people unable to hold their breath for more than one minute?
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Becuase when you hold your breath, metabolically produced CO2 begins accumulating in the blood. As a result, H+ accumulates and the blood becomes more acidic.
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