Diagram of a blood cell

This is a featured picture, which means that members of the community have identified it as one of the finest images on the English Wikipedia, adding significantly to its accompanying article. If you

have a different image of similar quality, be sure to upload it using the proper free license tag, add it to a relevant article, and nominate it. A blood type (also called a blood group) is a classification of blood, based on the presence and absence of antibodies and inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system.Some of these antigens are also present on the surface of other types of cells of In biology, the cell is the basic structure of organisms.All cells are made by the division of other cells. The environment outside the cell is separated from the cytoplasm inside the cell by the cell membrane.Inside some

cells, parts of the cell stay separate from other parts. These separate parts are called organelles (like small organs).They each do different things in the cell. Cytoplasm: This internal "soup" of the bacterial cell is bounded on the outside by the cell envelope.The cytoplasm is mostly water, but within it are the bacterial inclusions - nucleoid, plasmids, ribosomes and storage granules - as well as the components necessary for bacterial metabolism. The heart functions by pumping blood both to the lungs and to the systems of the body. To prevent blood from flowing backwards or “regurgitating” back into the heart, a system of one-way valves are present in the heart. Materials used in an a college-level cell biology class: FREE PPT lectures,

class notes, study guides, review questions, practice tests & science images & videos. Get information about blood in urine (hematuria) in males and females. Learn the causes of blood in urine and when the symptom may indicate a UTI. Some people experience blood in urine and no pain. Discover the reasons behind occult -- also known as microscopic or trace amounts of blood in urine. LabBench Activity Key Concepts Diffusion. Molecules are in constant motion and

tend to move from regions where they are in higher concentration to regions where they are less concentrated. Biology4Kids.com! This tutorial introduces cell structure. Other sections include plants, animal systems, invertebrates, vertebrates, and microorganisms. The Visible Embryo

is a visual guide through fetal development from fertilization through pregnancy to birth. As the most profound physiologic changes occur in the "first trimester" of pregnancy, these Carnegie stages are given prominence on the birth spiral. The shape and location of embryonic

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