What happens to the radiation that is soaked up by the atmosphere and Earth's surfaces? A. It changes into UV and greenhouse gases send it back to Earth.

B. It changes into IR and greenhouse gases send it back down to heat Earth.

C. It changes into greenhouse gases and gets released into space.

D. All the IR escapes into space.

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.