Which of the following statements is false? As an organism's activity level increases, the level of CO2 in the blood will increase and stimulate faster or stronger breathing. Breathing is controlled by both voluntary and involuntary mechanisms. Chemoreceptors involved in the homeostatic control of breathing are located in the brainstem and the carotid and aortic bodies. Decreasing levels of oxygen in the blood are detected by chemoreceptors in the brainstem.
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