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Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
During vigorous exercise, both the respiratory rate and heart rate increase significantly. Which statement best describes how these two systems coordinate to maintain cellular respiration and internal balance?
Correct Answer: C. The respiratory system increases oxygen intake while the cardiovascular system accelerates delivery of that oxygen to tissues and removal of carbon dioxide. During exercise, muscle metabolism increases, requiring more oxygen for cellular respiration and generating more carbon dioxide as a waste product. The respiratory system responds by increasing the rate and depth of breathing to supply more oxygen to the blood and expel CO₂ efficiently. Simultaneously, the cardiovascular system accelerates heart rate and stroke volume, pumping oxygen-rich blood to muscles and carrying CO₂ back to the lungs for removal. This coordination maintains homeostasis by balancing oxygen delivery and carbon dioxide removal, ensuring tissues have the energy needed for sustained activity.
Why the Other Options Are Incorrect:
A. The cardiovascular system slows blood flow to allow more oxygen to remain in the lungs.
Slower blood flow would reduce oxygen delivery to tissues. During exercise, blood flow increases to meet higher oxygen demands.
B. The respiratory system removes excess oxygen from the body to prevent oxidative stress.
Oxygen removal is not a physiological goal; cells require more oxygen during exercise, not less. Oxidative stress is controlled by antioxidants, not respiratory activity.
D. Both systems operate independently—one focusing on oxygen intake, the other on waste removal.
The respiratory and cardiovascular systems are tightly integrated. They coordinate to deliver oxygen and remove carbon dioxide simultaneously to maintain equilibrium.
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