The part of an experiment used for standard comparison

Scientific Method

Explanation:

In a scientific method, the control is the group that serves as the standard of comparison. The control group may be a “no treatment" or an “experimenter selected” group. The control group is exposed to the same conditions as the experimental group, except for the variable being tested.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.