. There is a direct link between carbon dioxide levels in the blood and respirat
ID: 3517162 • Letter: #
Question
. There is a direct link between carbon dioxide levels in the blood and respiratory rate. Using what you know about this connection answer the following questions. a. (5pts) Describe the relationship between CO2 and H+ using a chemical equation. b. (5pts) Explain what would happen to blood CO2 levels and blood pH when a person hyperventilates. 3. (10pts) Explain the role of chemoreceptors in the control of respiration. Be sure to include all parts of the feedback control process. Hint* How do chemical changes in the blood cause changes in respiratory rate? 4. Before Hannah started her race she voluntarily changed her breathing rate and depth. a. (5pts) Describe what would happen to her blood CO2 levels and thus stimulus to breathe as a result of this change. *Hint: Recall the relationship between breathing rate, blood CO2 levels, and chemoreceptors. b. (5pts) Explain why changing her breathing before the race could improve her 50 free race time.
Explanation / Answer
a) CO2 + H2O ---> H2CO3 ----> HCO3- + H+
TMThe above reaction is associated with respiration. According to the reaction when CO2 concentration increases, H+ concentration also increases in the blood, which implies the blood turns acidic.
b) When a person hyperventilates, more oxygen is taken in and CO2 concentration in the blood reduces. This causes a decrease in H+ ions and the pH becomes alkaline.
3. Chemoreceptors are present in respiratory centers and detects the pH of the blood. If the blood is acidic, a feedback is sent by these chemoreceptors to increase breathing rate. If the blood is alkaline, a feedback is sent by chemoreceptors to decrease the breathing rate.
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