Blood Flashcards, test questions and answers
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What is Blood?
Blood is an essential part of life. It is the fluid that transports oxygen and nutrients throughout the body, carries away wastes, helps regulate body temperature and keeps us healthy. Without it, no living organism can survive.Blood comes in four main types: A, B, AB and O. Each type has a different set of antigens that determine compatibility with other people’s blood types for transfusions or organ transplants. People with Type O negative blood are known as universal donors because their blood can be given to any person regardless of their blood type. Blood consists of red blood cells (RBCs), white blood cells (WBCs), platelets, plasma and various proteins which travel through tiny vessels known as capillaries to reach its destination in the body. It is responsible for carrying oxygen from our lungs to other parts of our bodies such as muscles and organs; it also carries carbon dioxide back to the lungs so we can breathe it out properly. The production of new red blood cells takes place in our bone marrow where stem cells transform into RBCs within 7-8 days before being released into circulation around our bodies through the bloodstream; this process is known as erythropoiesis and is essential for maintaining healthy levels of oxygenation within our tissues and organs. White Blood Cells (WBCs) help fight infections by attacking foreign organisms or substances in the bloodstream such as bacteria or viruses; these are produced in lymphatic tissues like bone marrow, thymus and spleen before being released into circulation where they are able to reach contaminated areas in order to destroy them effectively. Platelets help clotting by forming clumps when there is an injury which prevents excessive bleeding from occurring; these are produced from megakaryocytes located within bone marrow before circulating around with red corpuscles until they reach damaged sites where they adhere together tightly forming a plug so healing can take place more quickly without loss of too much vital fluids during this process platelet aggregation occurs here also due to chemicals released at injured sites stimulating them further towards forming a clot quicker than normal if left alone without medical intervention during surgery etcetera.