1. Parietal layer: The outermost layer of the serous pericardium.
2. Myocardium: Heart muscle.
3. Epicardium: Serous layer covering the heart muscle.
4. Endocardium: The inner lining of the heart.
question
Blood within the pulmonary veins returns to the ________.
answer
left atrium
question
When viewing a dissected heart, it is easy to visually discern the right and left ventricles by ________.
answer
noticing the thickness of the ventricle walls
question
Auricles slightly increase blood volume in the ventricles.
answer
F
question
Which heart chamber receives oxygenated blood from the lungs?
answer
left atrium
question
The __________ valve is located between the right atrium and the right ventricle.
1. Aortic semilunar valve: Prevents backflow into the left ventricle.
2. Tricuspid valve: Prevents backflow into the right atrium.
3. Mitral (bicuspid) valve: Prevents backflow into the left atrium.
4. Pulmonary semilunar valve: Prevents backflow into the right ventricle.
5. Mitral (bicuspid) valve: Atrioventricular (AV) valve with two flaps.
6. Tricuspid valve: Atrioventricular (AV) valve with three flaps.
question
Which valve is located between the right atrium and ventricle?
answer
tricuspid valve
question
Into which chamber of the heart do the superior vena cava, inferior vena cava, and coronary sinus return deoxygenated blood?
answer
right atrium
question
Which chamber of the heart sends oxygenated blood to the systemic circuit via the aorta?
answer
left ventricle
question
Which of the following does NOT deliver deoxygenated blood to the heart?
answer
pulmonary veins
question
The right side of the heart is considered the systemic circuit pump.
answer
F
question
The left ventricular wall of the heart is thicker than the right wall in order to ________.
answer
pump blood with greater pressure
question
Which vessel(s) of the heart receive(s) blood from the right ventricle?
answer
pulmonary trunk
question
Which of the following transports oxygen-rich blood?
answer
pulmonary vein
question
The myocardium receives its blood supply from the coronary arteries.
answer
T
question
Compared to skeletal muscle, cardiac muscle _______
answer
has gap junctions that allow it to act as a functional syncytium
question
At what rate does the sinoatrial (SA) node depolarize?
answer
75bpm
question
Which portion of the electrocardiogram represents the depolarization wave received by the atria from the sinoatrial (SA) node?
answer
P wave
question
Which portion of the electrocardiogram represents the time during which the ventricles are in systole?
answer
Q-T interval
question
The P wave on an electrocardiogram represents __________.
answer
atrial depolarization
question
The P wave of a normal electrocardiogram indicates ________.
answer
atrial depolarization
question
Which of the following is NOT part of the intrinsic conduction system of the heart?
answer
atrioventricular (AV) valve
question
Autonomic regulation of heart rate is via two reflex centers found in the pons.
answer
F
question
What does the QRS wave of the electrocardiogram (ECG) represent?
answer
ventricular depolarization
question
The first heart sound (the "lub" of the "lub-dup") is caused by __________
answer
closure of the atrioventricular valves
question
An abnormal P wave could be indicative of ______.
answer
enlarged atria
question
Isovolumetric contraction ________
answer
refers to the short period during ventricular systole when the ventricles are completely closed chambers
question
Which of the following would cause a DECREASE in cardiac output (CO)?
answer
decreasing thyroid function (thyroxine)
question
Which of the following would increase cardiac output?
answer
epinephrine
question
Increasing end-diastolic and end-systolic volume will increase stroke volume.
answer
F
question
Which of the following factors does NOT influence heart rate?
answer
skin color
question
If the vagal nerves to the heart were cut, the result would be that ________.
answer
the heart rate would increase by about 25 beats per minute
question
Given an end diastolic volume (EDV) of 120 ml / beat and an end systolic volume (ESV) of 50 ml / beat, the stroke volume (SV) would be ________.
answer
70 ml / beat
question
What is the expected heart rate when a heart is removed from a living body?
answer
What is the expected heart rate when a heart is removed from a living body?
100 beats / minute
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