Money Stack
Instructions: Practice your understanding of chemoreceptors and breathing by doing this activity.
1. The neural control of breathing rate and rhythm occurs in the respiratory center of the _____.
a. lungs
b. aortic arch
c. frontal lobe
d. brain stem
Answer: d - brain stem
2. Which of the following is NOT detected by chemoreceptors of the brain, aorta, and carotid arteries?
a. pH level
b. glucose levels
c. O2 level
d. CO2 level
Answer: b - glucose levels
3. If the chemoreceptors in your aorta sense a low oxygen level what would be the biological response?
a. Increased breathing rate
b. Decreased breathing rate
c. Nothing because this chemoreceptor does not detect oxygen levels.
d. It stays the same
Answer: a - Increased breathing rate
4. A patient in the hospital has had blood work completed and the results show a pH of 7.30. What will be the biological response to this pH?
a. Nothing because this is a normal range for pH.
b. decreased breathing rate
c. increased breathing rate
d. It stays the same
Answer: c - increased breathing rate
5. Which of the following factors sensed by chemoreceptors would cause an increase in respiratory rate (or breathing)?
a. Oxygen level of 91% @ You are correct! This value is below the set point of 95%-100%.
b. pH level of 7.45
c. Low CO2 level
d. High CO2 level
Answer: a - Oxygen level of 91% @ You are correct! This value is below the set point of 95%-100%.
6. The Bohr Effect states that the lower the pH, _____.
a. oxygen will not dissociate into the tissues
b. the more affinity oxygen has to hemoglobin
c. the less affinity oxygen has to hemoglobin
d. oxygen will not unload from hemoglobin into the tissues
Answer: c - the less affinity oxygen has to hemoglobin
Conclusion: Practice as much as you need. It only helps!
