Answer:
After leaving the heart, the red blood cell travels through the pulmonary artery to the lungs. There it picks up oxygen making the deoxygenated red blood cell now an oxygenated blood cell. The blood cell then makes it way back to the heart via the pulmonary vein into the left atrium.
Explanation:
second question answer yan
I think the answer to this is The Label.
Spongy bone, it is usually at the end of the long bone (the epiphyses)