As a person exercises, the carbon dioxide level in the blood increases. Which of the following systems are signaled by the nervo us system to respond to this increase in carbon dioxide? digestive and immune systems
immune and respiratory systems
circulatory and excretory systems
respiratory and circulatory systems
2 answers:
Circulatory and excretory system
Answer:
It is the immune and respiratory system
Explanation:
Since the two systems control the lungs, veins, and the upper part of the human body.
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