blood A fluid body tissue that acts as a transport medium within an animal. It is contained within a blood vascular system and in vertebrates is circulated by means of contractions of the heart. Oxygen and food are carried to tissues, and carbon dioxide and chemical (nitrogenous) waste are transported from tissues to excretory organs for disposal (excretion). In addition blood carries hormones and also acts as a defence system. Blood consists of a liquid (see blood plasma) containing blood cells (see erythrocyte; leucocyte) and platelets (see illustration).
blood Various blood cells suspended in plasma; carries nutrients and oxygen to tissues, and removes metabolic products. Oxygenated blood travels from the heart in arteries, while deoxygenated blood returns in veins; in the tissues the blood from the arteries enters smaller vessels, the arterioles, then capillaries, which then drain into venules, then the veins. See also blood plasma.
More From encyclopedia.com
Leucocyte , leucocyte (white blood cell) A colourless cell with a nucleus, found in blood and lymph. Leucocytes are formed in lymph nodes and red bone marrow and… Myelosuppression , Myelosuppression Description Myelosuppression is a decrease in the production of blood cells. Normal blood contains large numbers of cells, including… hemolysis , haemolysis The breakdown of red blood cells. A normal occurrence, chiefly in the blood sinuses of the spleen, when the cells are ageing after 3–4 mon… Blood Count , Definition One of the most commonly ordered clinical laboratory tests, a blood count, also called a complete blood count (CBC), is a basic evaluation… White Blood Cells , White blood cells Erythrocyte , e·ryth·ro·cyte / iˈri[unvoicedth]rəˌsīt/ • n. a red blood cell that (in humans) is typically a biconcave disc without a nucleus. Erythrocytes contain…
About this article
All Sources -
Updated Aug 24 2016 About encyclopedia.com content Print Topic
You Might Also Like
Blondin-Andrew, Hon. Ethel D., P.C., B.Ed. (Western Arctic) Minister of State (Northern Development). Secretary of State (Children and Youth)