Answer:
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.
The strong muscle in your upper body that you are talking about is called the diaphragm
True because light from the sun affects our melatonin
Charles Darwin said there where rudimentary parts on the embryos.These included the muscles of the ear<span>, </span>wisdom teeth<span>, the </span>appendix, the tail bone<span>, </span>body hair<span>, and the </span>semilunar<span> fold in the corner of the </span>eye<span>.</span>
