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Electrocardiogram Electrodes placed on body that detect electrical Changes that occur during heartbeat

Determines: 1-Conduction Pathways are normal 2. If the heart is enlarged 3. There is damage to certain Areas

P-waves are a type of elastic waves and are one of The two maine types of elasic body waves

QRS complex: the combination of 3 graphical deflections seen On electrodiogram

T wave

DiastoleCardiac Cycle § Diastole 2 atria contract while Ventricles relax § Systole Atria relax while ventricles Contract

Lymph node:Remove microorganisms, cellular debris, and Abnormal cells from lymph ±Then return lymph it to cardiovascular system ±Acts As a filter ±filter lymph before enters back to blood ±Hundreds located near Digestive tract, neck, armpits, groin

Spleen:Largest lymph organ 

Thymus gland: Lower neck above heart ± Functions peak only at Childhood ± Contains lymphocytes and epithelial cells ± Secretes thymosin and Thymopoietin that program lyphocytes

Reservoir;  Animal, person, plant where infectious agent Lives • Depends on reservoir for survival • Transmission from reservoir to host

Pathogen Could include bacteria, viruses, fungi, Protozoa, and possibly prions ±Rely of human cells for energy supply

Vectors : Animals • Fungi

Acute develops and runs course quickly

Chronic: slow to develop, less severe but may persist

Latent: periods of no symptoms between outbreaks

Epidemiology: Branch of medical science involved with Identifying the causes of an illness, its incidence, distribution and possible Control.

Viral Capsid: Viral capsid (or envelope) docks to receptors on Surface of cell to be infected.

Bacteriophage is a virus that infects and replicates in Bacteriu

Epidemic: number of cases increase

Pandemic :When epidemics occur at Global scale

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