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50 terms

Veneil AP CH 16

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This layer of the heart allows it to act as a pump.
myocardium
This sling-like structure supports the heart
pericardium
This is the hardest working cardiac chamber and therefore has the thickest myocardium.
right ventricle
The right ventricle pumps to the
pulmonary artery
Vessel(s) that carry(ies) blood from the pulmonary capillaries to the left atrium
pulmonary veins
The aorta receives blood from the
left ventricle
Blood flows from the right atrium through this atriovascular valve to the right ventricle
tricuspid
Which of the following structures "sees" unoxygenated blood?
pulmonary artery
Which of the following "sees" oxygenated blood?
pulmonary veins
Chordae tendineae are not associated with this valve
aortic
With which of the following is "lubb-dupp" associated?
closing of heart valves
Which of the following supplies oxygenated blood to the heart muscle?
coronary arteries
Where does the cardiac action potential (cardiac impulse) normally originate?
SA node
The pacemaker of the heart is located in the upper wall of the
right atrium
Referring to the ECG, the P wave represents
atrial depolarization
Referring the the ECG, the QRS complex represents
ventricular depolarization
This structure connects the cusps of the AV valves to the ventricles
chordae tendinae
These conducting fibers rapidly spread the electrical signal throughout the ventricles
Purkinje fibers
Which of the following is least related to the mitral valve?
semilunar
All of the following are electrical terms except
sarcomere
Which of the following must precede ventricular contraction?
ventricular depolarization
Which of the following semilunar valves "sees" oxygenated blood?
aortic
Complete the sequence: blood flows from the right atrium to the right ventricle to the pulmonary artery to the
pulmonary capillaries
What event causes the pulmonic valve to open?
an increase in the pressure within the right ventricle
Which layer of the heart has actin, myosin, and intercalated discs?
myocardium
The pericardium is part of the
epicardium
The mitral and the bicuspid valves
are the same valves
The pulmonic and aortic valves
are semilunar valves
Complete the sequence: blood flows from the pulmonary capillaries to the pulmonary veins to the left atrium to the left ventricle to the
aorta
The atrioventricular node (AV node)
delays the electrical signal coming from the atria into the ventricles
The purpose of this structure is to momentarily delay the spread of the signal from the atrium to the ventricles
AV node
Which of the following is an electrical event?
depolarization
Which of the following is a result of ventricular contraction?
Blood is pumped into the pulmonary artery and the aorta
Under what condition is blood most likely to flow "backward" (e.g., from the left ventricle back into the left atrium)?
an insufficient mitral valve
What are ventricles "doing" during atrial contraction?
relaxing
The Purkinje Fibers
conduct electrical signals throughout the ventricles
Which cavity first receives unoxygenated blood from the vena cava?
right atrium
What is the name of the valve that prevents backflow of blood into the right atrium when the right ventricle contracts?
tricuspid valve
What is the case of the heart sounds "lubb-dupp"?
closing of the heart valves
Which of the following is not true of the heart?
the pericardium is composed of actin and myosin
Which of the following is least descriptive of the myocardium?
thicker in the left atrium than the right ventricle
Which of the following is a function of a valve?
regulates the direction of the flow of blood through the heart
Which of the following is true of the structures of the electrical conduction system?
in normal sinus rhythm, the electrical signal arises within the SA node
Which of the following is least true of the aortic valve?
blood flows from the ventricle through this valve into the pulmonary artery
An accumulation of excess fluid in the pericardial space
causes external compression of the heart
A hole in the interventricular septum causes
blood to shunt from the left ventricle to the right ventricle
Which structure "sees" oxygenated blood
pulmonary veins
Which group is incorrect?
structures that carry unoxygenated blood: right ventricle, venae cavae, pulmonary veins
Which group is incorrect?
abnormal heart rates: tachycardia, bradycardia, normal sinus rhythm
Which group is incorrect?
parts of the conduction system: SA node, AV node, bundle of His, Purkinje fibers, medulla oblongata