Some drugs combat obesity or alcohol addiction by turning off pleasure centers in the brain. however, if the dosage is too high, theres a risk that people taking them will be plunged into depression. the statements above, if true, support which one of the following assertions

The amount of oxygen that is actually used by the body during the rest or a hand workout is determined by the heart rate, the stroke volume, and the amount of a. blood circulating in the vascular system b. oxygen removed from the vascular system c. oxygen provided to the vascular system d. blood that individual has in the body e. hemoglobin in the red blood cells