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A-Level Biology Revision Notes  

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PBL 1 Out firm 1. Define terms: Rouleaux: A cylindrical structure in the blood formed from several red blood cells piled one upon the other and adhering by their rims. Transient Ischaemic Attack: (TIA) The result of temporary disruption of the circulation to part of the brain due to embolism, thrombosis to brain arteries, or spasm of the vessel walls. The symptoms maybe similar to those of a stroke but patients recover within 24 hours. ESR: (Erythrocyte Sedimentation Rate) The rate at which red blood cells (erythrocytes) settle out of suspension in blood plasma, measured under standardized conditions. The ESR increases if the level of certain proteins in the plasma rises, as in rheumatic disease, chronic infections, and malignant disease, and thus provides a simple but valuable screening test for these conditions. Serum Ferritin: An iron-protein complex that is one of the forms in which iron is stored in the tissues. Reticulocytes: An immature red blood cell (erythrocyte). Reticulocytes maybe detected...

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