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Select the correct answer for underlined portion of the sentence.   On the last day of class, the textbooks were returned to the bookstore.

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Regarding the heart and its blood supply and oxygen use, which of the following is/are most accurate:                  

Parasympathetic effect on the heart includes which of the following?  

We measure lactate threshold because it:    

The A-V O2 difference that presents during physical activity:      

Ventilatory threshold is:  

CO2 is created at rest and in exercise, it is transported for removal:

In the lungs hemoglobin does not fully saturate with oxygen because at sea level a Po2 of 100 mmhg allows only 98% saturation: