chapter 18 mastering a and p
1. Parietal layer: 2. Myocardium: 3. Epicardium: 4. Endocardium:
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.
The left ventricular wall of the heart is thicker than the right wall in order to ________.
pump blood with greater pressure
If the vagal nerves to the heart were cut, the result would be that ________.
the heart rate would increase by about 25 beats per minute
1. Aortic semilunar valve: 2. Tricuspid valve: 3. Mitral (bicuspid) valve: 4. Pulmonary semilunar valve: 5. Mitral (bicuspid) valve: 6. Tricuspid valve:
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.
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 ________.
70 ml / beat
Which of the following is the innermost layer of the heart?
endocardium
Blood within the pulmonary veins returns to the ________.
left atrium
Which heart chamber receives oxygenated blood from the lungs?
left atrium
Which chamber of the heart sends oxygenated blood to the systemic circuit via the aorta?
left ventricle
Which layer of the heart wall contracts and is composed primarily of cardiac muscle tissue?
myocardium
When viewing a dissected heart, it is easy to visually discern the right and left ventricles by ________.
noticing the thickness of the ventricle walls
Which of these muscles is particularly associated with anchoring the right and left atrioventricular valves?
papillary muscles
Which vessel(s) of the heart receive(s) blood from the right ventricle?
pulmonary trunk
Which of the following transports oxygen-rich blood?
pulmonary vein
Which of the following does NOT deliver deoxygenated blood to the heart?
pulmonary veins
Which of these vessels returns blood to the left atrium of the heart?
pulmonary veins
Isovolumetric contraction ________
refers to the short period during ventricular systole when the ventricles are completely closed chambers
Into which chamber of the heart do the superior vena cava, inferior vena cava, and coronary sinus return deoxygenated blood?
right atrium
The right atrioventricular valve prevents backflow of blood from the right ventricle into the __________.
right atrium
Which of the following factors does NOT influence heart rate?
skin color
Which valve is located between the right atrium and ventricle?
tricuspid valve
The myocardium receives its blood supply from the coronary arteries.
T
Which portion of the electrocardiogram represents the time during which the ventricles are in systole?
Q-T interval
Auricles slightly increase blood volume in the ventricles.
F
Autonomic regulation of heart rate is via two reflex centers found in the pons.
F
Increasing end-diastolic and end-systolic volume will increase stroke volume.
F
Which of the following is NOT part of the intrinsic conduction system of the heart?
atrioventricular (AV) valve
Which of the following would increase cardiac output?
epinephrine
The __________ valve is located between the right atrium and the right ventricle.
tricuspid
What does the QRS wave of the electrocardiogram (ECG) represent?
ventricular depolarization
Compared to skeletal muscle, cardiac muscle _______
has gap junctions that allow it to act as a functional syncytium
At what rate does the sinoatrial (SA) node depolarize?
75bpm
The right side of the heart is considered the systemic circuit pump.
F
Which portion of the electrocardiogram represents the depolarization wave received by the atria from the sinoatrial (SA) node?
P wave
What is the expected heart rate when a heart is removed from a living body?
What is the expected heart rate when a heart is removed from a living body? 100 beats / minute
The P wave of a normal electrocardiogram indicates ________.
atrial depolarization
The P wave on an electrocardiogram represents __________.
atrial depolarization
Which of the following would cause a DECREASE in cardiac output (CO)?
decreasing thyroid function (thyroxine)
An abnormal P wave could be indicative of ______.
enlarged atria
The first heart sound (the "lub" of the "lub-dup") is caused by __________
closure of the atrioventricular valves
What separates the parietal and visceral pericardium?
pericardial cavity
