5. The hypodermis is/is not technically part of the skin, and is composed of fat cells known as? Plz help?

The deepest layer of the skin is the subcutaneous tissue, the hypodermis, or the subcutis. It is not technically part of the skin, but it helps attach the skin to the bones and muscles. Subcutaneous tissue also provides the skin with nerves and blood supply

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.