Question

multiple choice question
because of its abundance in both arterial and venous systemic blood,______does not affect respiration until its blood levels get abnormally low.
carbon dioxide
oxygen
need help? review these concept resources.

Explanation:

Carbon dioxide levels have a more immediate impact on respiration. Oxygen is abundant in both arterial and venous blood (arterial has higher levels, but even venous has some). The body's respiratory control centers are more sensitive to changes in carbon dioxide. However, when oxygen levels drop abnormally low (like in severe hypoxia), it starts to affect respiration.

Answer:

oxygen