Answer:

1.Heart, a muscular organ that pumps blood throughout your body.

2.Differences in these antigens are what makes one person's blood different from someone else's

3.Plasma is the main component of blood and consists mostly of water, with proteins, ions, nutrients, and wastes mixed in. Red blood cells are responsible for carrying oxygen and carbon dioxide. Platelets are responsible for blood clotting. White blood cells are part of the immune system and function in immune response.

4.Because the heart has its own electrical impulse, it can continue to beat even when separated from the body, as long as it has an adequate supply of oxygen. The “thump-thump” of a heartbeat is the sound made by the four valves of the heart closing.

5.Deoxygenated blood from the lower half of the body enters the heart from the inferior vena cava while deoxygenated blood from the upper body is delivered to the heart via the superior vena cava. Both the superior vena cava and inferior vena cava empty blood into the right atrium.

6.The deoxygenated blood returns from the body to the right atrium and from there enters the right ventricle that pumps it to the lungs through the main pulmonary artery (pulmonary trunk). In the lungs, the blood refills its oxygen supply and gets rid of carbon dioxide.

Explanation:

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