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EKG &Cardiac Testing
chapter 1 Anatomy & Phsoilogy of the heart
Question | Answer |
---|---|
inner layer of the heart is called | endocardium |
middle layer of the heart is called | myocardium |
outermost layer of the heart is called | epicardium |
what protects the heart | pericardium |
what is the fluid between the pericardium and epicardium called | pericardial fluid |
the bottom of the heart is called | apex |
the heart is located in the | mediastinum |
the heart is the size of a | fist |
feeds the heart wall | Coronary Arteries |
takes away the waste products | Coronary veins |
takes waste back to heart (right atria) | Coronary sinus |
how many chambers are there in the heart | 4 |
the 2 upper chambers of the heart are called | atria |
the bottom 2 chambers of the heart are called | right and left ventricle |
what separates the heart down the middle called | septum |
Co2 blood goes to the heart via the | superior and inferior vena cava |
the superior and inferior vena cava bring Co2 blood into what part of the heart | right atrium |
after the Co2 blood enters the right atrium it passes through the | tricuspid valve |
after the Co2 blood passes the tricuspid valve it goes where? | the Right ventricle |
when the Co2 blood leaves the right ventricle it leaves through the | Pulmonary semi-lunar valve |
the PSLV brings the blood to the | pulmonary arties |
pulmonary arties go to the | lungs |
how many pulmonary arties are there | 2 |
Oxygenated blood comes from the lungs to the heart via the | pulmonary veins |
how many pulmonary veins are there | 4 |
O2 blood comes through the pulmonary vein into what part of the heart | Left Atrium |
after 02 blood enters the Left Atrium it passes through the | bicuspid valve |
bicuspid AKA | mitral |
after the O2 blood passes through the bicuspid valve it goes where? | Left Ventricle |
The O2 blood leaves the Left ventricle it leaves through the | Aortic semi-lunar valve |
the ASLV brings the blood to the | Aorta |
The Aorta bring the Oxygenated blood to the | Rest Of the Body (ROB) |
Contraction phase = | Systole |
Relaxation phase = | Diastole |
Systole is the ______ pressure | Greatest |
Diastole is the _______ pressure | lowest |
the amount of blood pumped by one ventricle in one minute | Cardiac output |
how many liters of blood in an adult pump through the heart in one minute | 5-6 liters |
the heart beats how many times per minute | 60-100 |
the circulation of deoxygenated and oxygenated blood from the lungs to the heart and to the ROB is called | Cardiopulmonary circulation |
The cardiopulmonary Circulation is the ______ process of the heart | Mechanical |
The Cardiac conduction system is the ______ process of the heart | electrical |
Name all 8 steps of the Cardiac Conduction System | 1.SA node 2.Artial Depolarization 3.AV node 4.Bundle Of His 5.R & L Bundle Branches 6.Purkinje Fibers 7.Venricle Depolarization 8.Repolarization of the ventricles |
group of specialized cells located in the upper right atrium | SA node |
SA node stands for | Sino-Atrial |
Sinus means | normal |
the SA node AKA | the hearts natural pacemaker |
spark travel across atria and causes contraction of Atria | Atrial depolarization |
group of specialized cells that hold the impulse until the atria empties | AV node |
AV aka | the GATEKEEPER of the heart |
AV stands for | Artio-ventricular |
The AV is located @ the junction of the | Right Atrium and Right Ventricle |
The Bundle Of His, right & left bundle braches, and Purkinje Fibers are all need to make | Ventricle Depolarization |
Ventricle Depolarization is | ventricle contraction |
Repolarization of the ventricles means | relax and refill |
the record of the electrical activity of the heart | Electrocardiogram |
What are the 4 unique characteristics of myocardial cells | 1. Automaticity 2. Excitability 3. Conductivity 4. Contractility |
ALL myocardial cells have the ability to INITATE an impulse with out help from any system | Automaticity |
ALL myocardial cells have the ability to RESPOND to the impulse | Excitability |
ALL myocardial cells have the ability to RELAY the impulse to another cell | Conductivity |
All myocardial cells have he ability to respond with a PUMP ACTION | Contractility |
Inherent (Intrinsic) rates = | preset firing range |
SA node fires at | 60-100bpm |
AV node fires at | 40-60bpm |
the ventricular myocardial cells fire at | 20-40bpm |
if SA node is not firing but still fires outside it is called | ectopic focus |
A lower site takes over when SA node fails | Escape (good) |
A site speeds up and takes over pacing of the heart | irritability (bad) |
The heart has 2 type of cells they are | electrical and mechanical |
it initiates and conducts impulses | electrical |
contraction in response to stimulation | Mechanical |
Electrical proceeds mechanical activity. True or false? | true |
the sequence of the events that takes place during 1 complete heart beat | cardiac cycle |
what are the 3 Electrical Terms of the cardiac cycle | Polarization, Depolarization, Repolarization |
electrical charges are balanced "state of rest" | polarization |
discharge of energy that accompanies the transfer of electrical charges across the cell | depolarization |
is the return of electrical charges to their original state of readiness | repolarization |
there is a refractory period where the myocardial cells can not be stimulated; | Relaxation phase |
There are 2 parts of the Relaxation phase, what are they | absolute and relative refractory |
cells can NOT be stimulated at all | absolute refractory |
cells can be stimulated, BUT w/o the desired effect | relative refractory |
slows down the body process | Parasympathetic nerves |