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12 Cards in this Set
- Front
- Back
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describe blood and its cellular and non cellular products
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Blood is a fluid tissue because it has a matrix (plasma) and living blood cells known as formed elements.
Erythrocytes Red blood cells Transport oxygen Leukocytes White blood cells Act in various ways to protect the body Platelets Cell fragments that help stop bleeding |
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what are the fxns of blood?
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Transportation of Nutrients and Gases
Regulation (Homeostasis) Protection |
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what is normal hematocrit?
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45% RBC
<1% WBC and Platelets 55% Plasma Females 42 + 5 Males 47 + 5 |
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what does hemoglobin do?
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Reversibly bind with oxygen on erythrocytes
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Each hemoglobin molecule can transport _____ molecules of oxygen.
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4 Molecules of Oxygen
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describe coagulation and its various mechanisms
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Coagulation reinforces the platelet plug with fibrin threads that act as a “molecular glue” for the aggregated platelets.
Follows intrinsic and extrinsic pathways Steps Prothrombin activator is formed. Prothrombin is converted into thrombin. Thrombin catalyzes the joining of fibrinogen into a fibrin mesh. |
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describe platelet plug formation
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Platelets stick together and form a plug that temporarily seals the break in the vessel wall.
Steps With the help of von Willebrand factor, the platelets adhere to collagen. They are stimulated by thromboxane A2 Platelets stick to exposed collagen fibers and form a platelet plug. Serotinin and ADP is released, which attract more platelets. |
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what is anemia?
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Too few red blood cells lead to tissue hypoxia
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Too many red blood cells cause undesirable ______ ________.
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Blood Viscosity
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describe leukocyte disorders
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Myelocytic leukemia involves myeloblasts.
Lymphocytic leukemia involves lymphocytes. Acute leukemia involves blast-type cells and primarily affects children. Chronic leukemia is more prevalent in older people. |
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describe leukemia
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Immature white blood cells are found in the bloodstream.
Bone marrow is occupied with cancerous leukocytes. White blood cells that are produced are not functional. Death is caused by internal hemorrhage and overwhelming infections. Treatments: Irradiation Antileukemic Drugs Bone Marrow Transplants |
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where is the blood cell formation completed in the fetus?
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yolk sac
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