med surg final Flashcards
(471 cards)
myocardium
heart muscle
perdcardium
protective covering of the heart
septum
muscualr wall that divided the heart
blood
superior vena cavaright atriumtricuspid valveright ventrclepulmonic semilunar valavelungs (oxygen)pulmonary veinsleft atriummitral valveleft ventricleaortic semiluar valveaorta body
MAP
to maintain adequate blood flow through the coronary arteries the mean arterial pressure must be at 60-70-to maintain perfusion at major body organs
diatole
filling
systole
contracing
CO
CO=HRxSVblood flow to systemic circulation is measured by CO (which is the amount of blood pumped from each ventricle each minture)-cardiact index is measured to adjust the differeces in people with different body sizes ( by dividing the CO by total body area)
SV
amount of blood ejected by the left ventricle during each contraction
preload
the degree of myocardial strech at the end of diastole just before contraction-determined by the amount of blood reurining to the heart from both the venous system and pulmonary system
afterload
pressure that the ventricles must overcome to eject blood
impedance
pressure heart must overcome to open aortic valve
arterial system
blood movies from larger arteirs to smaller blood vessles called arterioles-to deliver oxygen and nutrients to tissues
venours system
blood travels from capilaries to venules and to the larfer system of veins eventually returning to the vena cava-returns blood back to heart
BP
force of blood against the vessel wallsBP=COxperipheral vascular resistance
BP mechanisms
ANS- excited/inhibits SNS in response to the chemoreceptroskidneys- sence change in blood volume and activate the renin angiotenisn mechanismendocrine- relase hormones
systolic bp
amount of froce generated by left ventricle to take blood to aorta
diastolic bp
amount of force against arterial wall during relaxation phase of the heart
peripheral chemoreceptros
sensitive to hypoxemia- decrease in arterial oxygen. when stimulated they vasoconstrict and increase BP
hypercapnia
increase in partial pressure of arterial carbon dioxide
kidneys
when blood flow deacreases the kidneyes retain water and sodium and BP rises.
BMI
overweight 25-30obese >30
MI
increases in woemn older than 35 who smoke and take contrecaptives
CVD
chest pain dyspneafatiguepalpitationsweight gainsyncope