cardiac pacemaker channels that open in response to hyperpolarization; AKA funny channels
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afterload/ESV
amount of blood remaining in the ventricle following contraction
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systemic circulation
blood flow to and from virtually all tissues of body
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vein
any vessel returning blood to the heart
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pacemaker potenial
spontaneous depolarization of the pacemaker region of the heart; SA node
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cardiac cycle
repeating pattern of systole and diastole of the atria and ventricles
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erythrocyte
red blood cell
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agglutinate
clumping of cells as a result of chemical interactions between surface antigens and antibodies
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isovolumetric ventricular relaxation
AV and semilunar valves are closed; early phase of ventricular diastole
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cardiac output
volume of blood pumped by either the right or left ventricle each minute
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sounds of karotkoff
turbulent flow of blood through the constricted artery creating sounds
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stroke volume
amount of blood ejected from each ventricle at each heartbeat
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preload/EDV
amount of blood in the ventricle just prior to contraction; in the ventricles of the heart the tension on the ventricular walls produced by filling w/blood
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interstitial fluid
fluid outside the cells within organ; this plus plasma equals extracellular fluid
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hemostasis
cessation of bleeding
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osmoreceptor
sensory neuron that responds to changes in osmotic pressure of surrounding fluid
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pulse pressure
difference between diastolic and systolic pressures
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barorectpor
receptors for arterial blood pressure located in the aortic arch and the carotid sinuses
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plasma
fluid portion of the blood
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artery
thick walled elastic vessels that carry blood away from the heart
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systole
phase of ventricular contraction in the cardiac cycle
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fibrin
insoluble protein formed from fibrinogen by the enzymatic action of thrombin during blood clot formation
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capillary
smallest blood vessels; most exchange of nutrients and waste occurs with interstitial fluid
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Frank-Starling law of the heart
describes the relationship between EDV and stroke volume. a great amount of blood prior to contraction results in a greater stretch of the myocardium
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pulmonary circulation
part of vascular system that includes pulmonary arteries and pulmonary veins. transports blood from right ventricle of the heart through the lungs and back to the left atrium of the heart
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hemoglobin
protein in red blood cell that transports oxygen
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atrioventricular valves
one way valves located between atria and ventricles
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platelet plug
layers of platelets at the site of an injury
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diastole
phase of ventricular relaxation which the heart fills with blood
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sinoatrial node
pacemaker of the heart, bundle of cardiac tissue
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circulatory/cardiovascular system function
* transport oxygen/CO2, products of digestion, waste * regulate hormones and temperature * clotting, immune