Chapter 6: Cardiovascular System Flashcards
brady-
slow
ecto-
out, outside
macro-
large
micro-
small
oligo-
deficiency
pre-
before
pro-
before, forward
re-, retro-
behind, back
tachy-
rapid
-ary
pertaining to
-cyte
cell
-dynia
pain
-edema
swelling
-emesis
vomiting
-genesis
creating, producing
-gram
record
-lysis
destruction
-megaly
enlargement
-metry
measurement
-oid
resembling
-rrhaphy
suture, suturing
-rrhexis
rupture
-sclerosis
abnormal condition of hardening
-stasis
cessation, stopping
Mediastinum
area in the center of your chest, slightly to the left, where your heart resides
Three Layers:
epicardium
myocardium
endocardium
Epicardium
outer lining of the heart
myocardium
middle muscle layer
endocardium
inner lining of the heart
Pericardium
fibrous membrane in which the heart is enclosed
also called the pericardial sac
pericardial fluid
small amount of fluid in the pericardium
acts as a lubricant that reduces friction as the heart repeatedly contracts and relaxes
Venous insufficiency
difficulty moving blood in the body back to the heart, helps to elevate legs
arterial insufficiency
difficulty moving blood from the heart to the body, elevating legs does not help
Atria
two upper chambers of the heart, left and right atria, which receive blood and perform 30% of the work
both atria contract at same time, but pump blood into different areas.
Right ATRIUM pumps blood downward through tricuspid valve into right ventricle.
Left ATRIUM receives blood from pulmonary veins, when it contracts it forces blood downward through mitral valve into left ventricle
Ventricles
larger, lower chambers of the heart
right and left ventricles
perform 70% of the work
Right ventricle contracts it forces blood up and out through pulmonary valve into pulmonary arteries, lead to lungs where carbon dioxide is exchanged for oxygen.
Left ventricle pumps blood upward and out through aortic valve into aorta and out to various parts of the body
What is the largest chamber of the heart?
left ventricle, largest and most muscular chamber, because it pumps blood and therefore works harder than any of the others
Septum
thick layer of muscle tissue that divides the right and left sides of the heart
Bicuspid valve
mitral, exits the left atrium into the left ventricle
Pulmonary valve
exits the right ventricle into the pulmonary arteries
Aortic Valve
exits the left ventricle into the aorta
Apex
largest part of the heart, lower left area
Auscultating
(listening to) sounds from the mitral valve where apical pulse is best heard
Apical Pulse
pulse point on your chest at bottom tip (apex) of your heart
listening to apical pulse for 1 full minute most accurate method for measuring heart rate, preferred method in situations in which accuracy is important
Venae cavae
blood that is low in oxygen but high in carbon dioxide returns from the body to the right atrium VIA the inferior and superior venae cava
Pulmonary Arteries
the only arteries in the body that transport oxygen-poor blood
blood circulates through lungs and gets rid of carbon dioxide and picks up oxygen. then pumps back into heart through pulmonary veins into the left atrium
Pulmonary Veins
unique in that they are the only veins that transport oxygen rich blood.
blood from lungs returns through pulmonary veins to the left atrium.
Mnemonic for remembering the order of blood flow through valves of the heart
Try Performing Better Always
Tricuspid
Pulmonary
Bicuspid
Aortic
Pulse Oximeter
device used to monitor heart rate and measure the saturation of peripheral oxygen (SpO2) in the blood
differentiates between oxygenated and deoxygenated blood by passing two beams of light, infrared and red, through the finger to a light detector
Bright red oxygenated blood absorbs more infrared light
dark red deoxygenated hemoglobin absorbs more red light
Normal SpO2 for healthy individuals is 96% to 99%
Arteries
intricate network where oxygen-rich blood is pumped from the heart to all parts of the body
Arterioles
tiny arteries
Capillaries
microscopic-sized arteries with walls that are just one cell thick
blood that is low in O2 and high in CO2 and waste leaves the capillaries
Venules
tiny veins
Blood that is low in O and high in CO and waste leaves the capillaries and enters these microscopic-sized veins.
Veins
blood from body into heart
blood is drained from head and upper body via the superior vena cava and from the lower body via inferior vena cava
travels under much less pressure than arterial blood
contain one way valves that facilitate circulation by preventing the backflow of blood
pumping action created by contraction and relaxation of leg muscles also helps propel blood upward
How many Americans did the CDC say have heart attacks yearly in August 2017 report?
about 790,000 Americans
580,000 are first heart attacks
210,000 are those who have already had a heart attack
arteriosclerosis
vessels become narrowed and hardened due to several factors including hypertension, cholesterol build up.
hypertension
high blood pressure
cholesterol
fatty, plaque-like substance may build up inside surfaces of the coronary vessels causing further narrowing or even blockage
Coronary Artery Disease
CAD
sometimes also called Atherosclerotic heart disease (ASHD
occluded
blocked
myocardial infarction (MI
heart attack
Sinoatrial (SA) node
cluster of specialized cells in your right atrium
serves as natural pacemaker for the heart, initiating an electrical impulse about 60 to 100 beats per minute
Depolarization
the resulting electrical charge after electrical impulses are transmitted throughout all the muscle cells in the heart. the inside of the cardiac muscle cells become electrically positive in relation to the outside.
in response, the individual cardiac muscle cells in your atria contract in unison.
Normal rhythm
normal sinus rhythm
atrioventricular (AV) node
floor of right atrium, sometimes thought of as backup pacemaker
receives impulse from SA node and transmits it down to both ventricles via the bundle of His located within the septum and Purkinje fibers distributed through the septum and throughout the ventricles.
occurs just slightly after contraction of the atria, combination of the two results in one complete heartbeat.
how blood pressure readings work
reflect the amount of pressure exerted against the arterial walls during ventricular contraction and ventricular relaxation phases of the cardiac cycle.
130/80 or higher is considered high blood pressure by the American Heart Association
cardiac cycle
contraction and relaxation of the four heart chambers
average cardiac cycle is 0.8 seconds
Systole
Blood that is low in O and high in CO and waste leaves the capillaries and enters these microscopic-sized veins.
the phase of the heartbeat when the heart muscle contracts and pumps blood from the chambers into the arteries.
systolic pressure, upper number in blood pressure ex 120/80
reflects highest pressure exerted against artery walls during ventricular contraction
Diastole
Lowest pressure exerted against artery walls during ventricular relaxation
the phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood.
lower number, diastolic pressure, reflects lowest pressure exerted against artery walls during ventricular relaxation.
ex 120/80
Pulse point
large arteries in the body that have a strong pulse and are easily palpated
Tricuspid valve
exits the right atrium into the right ventricle