A because none of the others would work
The saying is treat all guns as if they are loaded.
There are several ways to do this:
- Social media
- Word of mouth to friends, family, relatives
- Newspaper ads
- Events section in magazines/newspapers
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.
