Key Terms Flashcards
Plasma
The liquid part of the blood that contains many dissolved substances
Erythrocytes
The red blood cells that carry oxygen
Has no nucleus and organelles
Hemoglobin
Iron containing protein in red blood cells that carry oxygen
Leukocytes
White blood cells that defend the body against bacteria viruses and otherinvaders
Formed elements
Erythrocytes,leukocytes,and platelets that makeup 45% of whole blood
Phagocytosis
White blood cells engulfing and destroying microorganisms and other foreign or toxic substances
Macrophages
Form that monocytes take when they enter infected tissues to engulf and destroy target cells
Hematocrit
The ratio of blood formed elements to total blood volume
Antigens
Proteins on the surface of red blood cells that determine blood type and the type of antibodies that will be produced in the plasma
Antibodies
Proteins produced in the plasma to fight against antigens
Agglutination
Clumping that indicates presence of an antigen
Buffy coat
Centrifuged platelets and white blood cells
Hematocrit
% of RBCs in blood
Mediastinum
The middle cavity of the thoracic cavity where the heart is located
Epicardium
The outer layer of the heart wall
Myocardium
The thick muscular layer of the heart wall that contracts
Endocardium
The layer of the heart wall that lines the heart chambers
Deepest
Coronary circulation
The blood vessels that supply and drain the myocardium of the heart
Atria
The upper chambers that receive blood
Ventricles
The lower chambers that discharge blood
Atrioventricular valves
The valves that control the flow of blood between the atria and ventricles
Semi lunar valves
The valves that control the flow of blood between the ventricles in the large vessels that exit the heart
Chordae tendineae
Tenderness chords that anchor the AV valves to prevent them from blowing back up into the atria during ventricular contraction
Pulmonary circulation
Blood flow from the heart to the lungs in back to the heart
Systemic circulation
Blood flow from the heart to the body in back to the heart
Intrinsic conduction system
Electrical system of the heart that sets the basic rhythm it’s composed of the SA node the AV node bundle of His R/L bundle branches and Purkinje fibers
SA node
Starts each heartbeat
PACEMAKER
Systole
Refers to the contraction of the ventricles
Diastole 
Refers to the relaxation of the ventricles
Cardiac cycle
Includes all the events in heartbeat which include the contraction and relaxation of both atria and ventricles
Electrocardiogram
A recording of the flow of electrical impulses that travel through the heart
Tachycardia
Rapid heart rate over 100 bpm
Myocardial infarction
Heart attack due to lack of blood
Atherosclerosis
Narrowing of artenes due to accumulation of plaque
Circle of Willis
Circle of connecting blood vessels that protects the veins by providing more than one route for blood
Hepatic portal circulation
Came blood from digestive organs and the spleen to the liver to be processed before entering systemic circulation
Ischemic stroke
When blood flow is blocked to an area of the brain due to a blood clot
Hemorrhage stroke
Bleeding in brain due to a broken blood vessel
Cardiomyopathy
Hard to pump blood, left ventricle wall or chamber may enlarge
Heart value disease
When heart valve do not close properly in to heart condition, infection, or aging
