What is unique about the protein channels which allow
molecules to travel by
facilitated diffusion?

A. Each channel only allows one type of molecule to pass through it

B. The channels modify the molecule's DNA as they pass through

C. The channels move molecules very quickly

PLEASE AND TANK U❤️❤️❤️

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.