Not much according to Consumer Reportsâ latest mattress tests. The Sleep Number c2 Bed matched the Sleep Number i8 bed Pillowtop, $3,000, in our tests for back and side support. Even better, we bought the Sleep Number c2 Bed on sale for $700. Here are the details plus news on other new mattresses in our tests. For our body-support tests we graph the spineâs natural curve on a range of test subjects.
1. The fluid consisting of plasma, red blood cells, white blood cells, and platelets that is circulated by the heart through the arteries and veins, carrying oxygen and nutrients to and waste materials away from all body tissues. 2.lood varies in color from a bright red in the arteries to a duller red in the veins. The total quantity of blood within an individual depends upon body weight; a person weighing 70 kg (154 lb) has about 4.5 liters of blood in the body.
Human blood is a beautiful red color, but the blood of some animalsâand of humans under certain conditionsâis a different color. The function of all blood is to transport vital substances around the body. Animals may transport some materials in a different way from humans, however. In humans, oxygenated blood is bright red and deoxygenated blood is dark red or maroon. The color is due to the presence of hemoglobin molecules in the red blood cells. Hemoglobin is a respiratory pigment. It transports oxygen to the tissue cells, which need the chemical to produce energy.