How is human eyesight related to the electromagnetic spectrum? A- human eyes can only detect the portions of the spectrum that have the lowest frequencies

B- human eyes can only detect the portions of the spectrum that have the highest frequencies

C- human eyes can only detect the visible light portion of the spectrum

D- human eyes can detect all parts of the spectrum

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.

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