Structure/Function
Cardiac Output
Intrinsic conduction system
Blood Flow
Random
100
Why are the walls of the left ventricle thicker than the right ventricle?
The left ventricle pumps blood through the systemic circuit at high pressure, requiring thicker muscular walls than the right ventricle, which pumps blood to the lungs.
100
What is the average Cardiac output(CO) in an adult
A.5.25 liter/minute
B.1.25 liter/minute
C.600ml/minute
D.52.5 liter/minute
A. 5.25 liter/minute
The total blood volume of 5.25 liters in an average adult runs through the heart in 1 minute
100
The Intrinsic conduction system is measured using an____
A.SphygomanometerB.EKG
C.Glucometer
D.Refractormeter
B.EKG
100
What structure does oxygenated blood pass through to enter the left atrium from the lungs?
A) Pulmonary veins
B) Aorta
C) Pulmonary arteries
D) Inferior vena cava
A) Pulmonary veins
100
lub dub
lub-closing of AV valves
Dub-closing of SL valves
200
The order in which the heart chambers contract is
A.random
B.First the left chambers, then the right chambers
C.Both Atria, then both ventricles
D.Right atrium,right ventricles, left atrium, left ventricle
C. Both atria, then both ventricles
200
What is the formula for cardiac output
CO(ml/min)=HR(bt/min)*SV(ml/bt)
200
True or false a Flat line(Asystole) is a shockable rhythm
False. Only shockable rhythms are V-Tach and V-Fib
200
Which of the following structures does blood pass through after leaving the left ventricle?
A) Pulmonary artery
B) Aortic valve
C) Right atrium
D) Pulmonary veins
B) Aortic valve
200
True or false, In ventricular contraction the AV valves are open
FASLE; The AV valves ARE CLOSED and the SL Valves are OPEN. Blood rushes from ventricles to either the aorta or pulmonary trunk, so SL valves are OPEN
300
The portion of the intrinsic conduction system located in the superior interventricular septum is the
(a) AV node,
(b) SA node,
(c) AV bundle,
(d) subendocardial conducting network.
(b)AV bundle
300
Define cardiac output. What are its units
The amount of blood(ml) pumped out of each ventricle in 1 minute(min); ml/min
300
Why is the AV node important in preventing atrial fibrillation from causing inefficient ventricular contraction?
A) It prevents electrical signals from the SA node from reaching the ventricles
B) It allows for the contraction of the ventricles even when the atria are in fibrillation
C) It acts as a pacemaker in the absence of the SA node
D) It delays the electrical impulse, preventing rapid atrial depolarization from overwhelming the ventricles
D) It delays the electrical impulse, preventing rapid atrial depolarization from overwhelming the ventricles
300
What 3 structures does the right atrium receive blood from? Is the blood oxygenated or deoxygenated?
Inf Vena cava,Sup Vena cava, Coronary sinus; Deoxygenated
300
A downward dip in the arterial pressure waveform that occurs when the aortic valve closes
A.Aortic DiastoleB.Congestive Heart Failure
C.Dicrotic notch
D. Heart attack
C.Dicrotic notch
400
The chordae tendineae
(a) close the atrioventricular valves,
(b) prevent the AV valve flaps from everting,
(c) contract the papillary muscles,
(d) Open the semilunar valves.
(b) prevent the AV valve flaps from everting,
400
Yes. Ventricular systole = ventricles contracting. Purkinje fibers are in the walls of the ventricles and also in the papillary muscles so when ventricles contract, papillary muscles also contract.
400
During which phase of the cardiac cycle does blood flow from the left atrium to the left ventricle?
A) Atrial systole
B) Isovolumetric contraction
C) Ventricular systole
D) Ventricular diastole
A) Atrial systole – During atrial systole, the left atrium contracts, pushing blood through the mitral valve into the left ventricle.
400
A Myocardial Infraction is when there is a decrease of _______ to the heart tissues causing the cells to die
O2; can also happen if coronary arteries gets blocked
500
An Increase in EDV would do what to Stroke volume(SV)
^EDV-->^SV
EDV has the bigger blood volume because blood fills atria during relaxation
500
Electrical events lead to mechanical events. For example, the P wave represents ____________ depolarization, which leads to atrial _____________.
Atrial;contraction
500
Which of the following is the correct pathway for deoxygenated blood from the body to the lungs?
A) Right atrium → Left atrium → Pulmonary veins
B) Right atrium → Right ventricle → Pulmonary arteries
C) Left atrium → Left ventricle → Pulmonary arteries
D) Right atrium → Right ventricle → Pulmonary veins
B) Right atrium → Right ventricle → Pulmonary arteries
500
What is occuring in the isovolumetric contraction phase?
-AV & SL valves are CLOSED
-Atria relaxes, ventricles contract, increasing pressure
-Blood stays the same