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10 Cards in this Set

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What are sensory receptors in the body that are sensitive to chemical composition of body fluids?
chemoreceptors
Where are the 2 sets of chemoreceptors that are sensitive to pH?
medulla oblongata of the brain stem, and also in the carotid bodies (in the neck and aortic bodies in the aorta)
Why do you inhale?
Because of plasma acidity directly caused by carbon dioxide
What are the chemoreceptors stimulated by?
When the carbon dioxide entering the blood is sufficient to change blood pH.
What is increased carbon dioxide due to?
its ability to from free hydrogen ion when acted upon by carbonic anhydrase
Reduced oxygen levels can cause increased respiration, but how strong is its stimulus?
relatively weak
How does the baby take its first breath?
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.
What type of breathers are babies?
Diaphragmatic breathers, and nose breathers
What does the respiratory center do when the pH of the blood decreases?
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
Why are most people unable to hold their breath for more than one minute?
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.