What is difference in scale between a human cell and a virus.

Explanation:

Our bodies are comprised of cells, and contrasted with us they're small. ... Furthermore, infections are more modest again — they're about a hundredth the size of our cells. So we're around multiple times greater than our cells, multiple times greater than microbes, and 10 million times greater than your normal infection

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.