Cardiopulmonary Flashcards
apex (heart)
lowest part of the heart formed by the inferolateral part of the left ventricle. It projects anteriorly and to the left at the level of the 5th intercostal space and the left midclavicular line.
base (heart)
the upper border of the heart involving the left atrium, part of the right atrium, and the proximal portions of the great vessels. It lies approximately below the second rib at the level of the 2nd intercostal space.
endocardium
the endothelial tissue that lines the interior of the heart chambers and valves.
epicardium
the serous layer of the pericardium. The epicardium contains the epicardial coronary arteries and veins, autonomic nerves, and lymphatics
myocardium
the thick contractile middle layer of muscle cells that forms the bulk of the heart wall
pericardium
a double-walled connective tissue sac that surrounds the outside of the heart and great vessels
aorta
body’s largest artery and the central conduit of blood from the heart to the body.
inferior vena cava
the vein that returns venous blood from the lower body and viscera to the right atrium
pulmonary arteries
the arteries that carry deoxygenated blood from the right ventricle to the left and right lungs
pulmonary veins
the veins that carry oxygenated blood from the right and left lungs to the left atrium
superior vena cava
the vein that returns venous blood from the head, neck, and arms to the right atrium
atrial systole
contraction of the right and left atria pushing blood into the ventricles
atrial diastole
the period between atrial contractions when the atria are repolarzing
ventricular systole
contraction of the right and left ventricles pushing blood into the pulmonary arteries and aorta
ventricular diastole
the period between ventricular contractions when the ventricles are repolarizing
preload
refers to the tension in the ventricular wall at the end of diastole.
Reflects the venous filling pressure that fills the left ventricle during diastole.
afterload
refers to the forces that impede the flow of blood out of the heart, primarily the pressure in the peripheral vasculature, the compliance of the aorta, and the mass and viscosity of the blood
stroke volume (SV)
refers to the volume of blood ejected by each contraction of the left ventricle.
Normal SV ranges from 60 to 80 mL depending on age, sex, and activity
cardiac output (CO)
the amount of blood pumped from the left or right ventricle per minute. It is equal to the product of SV and HR. (CO = HR x SV)
Normal CO for adult male at rest = 4.5-5.0 L/min with women producing slightly less.
CO can increase up to 25 L/min during exercise
venous return
amount of blood that returns to the right atrium each minute. This is similar in volume to the CO.
Because the cardiovascular system is a closed loop, venous return must equal CO when averaged over time.
hypovalemia
decreased blood volume, specifically the volume of plasma
hypervalemia
“fluid overload” - increased blood plasma
neutrophils
help protect the body against infections by ingesting bacteria and debris
lymphyocytes
consist of 3 main types - T lymphocytes and natural killer cells that help protect against viral infections and can detect and destroy some cancer cells, and B lymphocytes, which develop into cells that produce antibodies
monocytes
ingest dead or damaged cells and help defend against infectious organisms
eosinophils
kill parasites, destroy cancer cells, and are involved in allergic responses
basophils
participate in allergic responses
baroreceptors
mechanoreceptors that detect changes in pressure
arterial baroreceptors
high pressure receptors located in the carotid sinus, aortic arch, and origin of the right subclavian artery
Cardiopumonary receptors
low pressure receptors
acidemia
elevated acidity of blood (pH < 7.35)