heart stuff
Match the following term with its correct description: conduction system cells that delay the impulse for about 0.1 seconds.
AV node
Match the given term with its correct description: ventricular depolarization
QRS complex
Match the following term with its correct description: a faster depolarizing pacemaker cells.
SA node
Choose the correct sequence of current flow through the heart wall.
SA node, AV node, AV bundle, right and left bundle branches, Purkinje fibers
The second heart sound (the 'dup' of 'lub-dup') is caused by the __________.
closure of the semilunar valve
Guided by powerful signaling molecules, the human heart develops from __________.
mesoderm
Match the following vessel with its correct 'destination': aorta.
most body tissues
Match the following vessel with its correct 'destination': coronary artery.
myocardium
Match the area of the heart with the structure from which it receives blood: left atrium
pulmonary veins
Match the following term with its correct description: brings oxygen-rich blood from the lungs to the left atrium.
pulmonary veins
Match the following term to its correct description: cardiac cycle.
the events associated with blood flow through the heart during one complete heartbeat
Match the following abbreviation with its definition: HR.
the frequency at which the heart beats
Match the following vessel with its correct 'destination': pulmonary trunk.
the lungs
Which of the following valves is most often faulty in the heart?
the mitral, or bicuspid, valve
normal pacemaker of the heart is the __________.
SA node
Indicate the valve separating the following areas of the heart: left ventricle and aorta.
aortic semilunar valve
Match the area of the heart with the "exit" through which the blood leaves: left ventricle.
aortic semilunar valve
The superior chambers of the heart are called the __________.
atria
Match the following term with its correct description: atrial depolarization
p wave
Match the area of the heart with the structure from which it receives blood: right atrium.
vena cava
The trabeculae carneae are located in the __________.
ventricles
Which of the following structures lies on the outside surface of the heart and is an integral part of the heart wall?
epicardium
Which of the following is NOT a role of the pericardium?
It facilitates heart contraction.
Which of the following is a difference between cardiac muscle and skeletal muscle?
Unlike skeletal muscle cells, cardiac muscle cells can be autorhythmic
Which of the following factors gives the myocardium its high resistance to fatigue?
a very large number of mitochondria in the cytoplasm
Match the following abbreviation with its definition: SV.
amount of blood ejected by one contraction of the heart
the following abbreviation with its definition: ESV
amount of blood in the ventricle at the end of contraction
Match the area of the heart with the structure from which it receives blood: coronary artery.
aorta
Match the following term with its correct description: the left ventricle sends blood into this vessel
aorta
The coronary arteries arise from the __________.
aorta
The P wave of an electrocardiogram represents __________.
atrial depolarization
The ability of some cardiac muscle cells to initiate their own depolarization and cause depolarization of the rest of the heart is called __________.
automaticity
The __________ are attached to the AV valve flaps
chordae tendinae
Match the following term to its correct description: systole.
contraction
The vessels that carry oxygen to the myocardium are called __________.
coronary arteries
Which is correctly paired?
ectopic focus: an abnormal pacemaker
The lining of the heart chambers is called the __________.
endocardium
Which is the correct sequence of layers in the heart wall, starting with the outer layer?
epicardium, myocardium, endocardium
The cells of the myocardium behave as a single, coordinated unit called a __________.
functional syncytium
Match the following structure with its description: endocardium.
glistening white sheet of endothelium lining on the inside of the heart
A doctor puts his stethoscope on a patient's chest over the location of the heart and hears a swishing sound. Which of the following conditions is the best diagnosis for the patient's condition?
incompetent cardiac valve
Match the following term with its correct description: brings oxygen-poor blood from the lower body to the right atrium.
inferior vena cava
Match the following structure with its description: epicardium.
inner layer of pericardium (called the visceral layer)
The interventricular septum forms a dividing wall between the __________.
left and right ventricles
Into which chamber of the heart do the pulmonary veins deliver blood?
left atrium
Match the area of the heart with the structure from which it receives blood: left ventricle.
left atrium
Match the following vessel with its correct 'destination': pulmonary veins.
left atrium
Freshly oxygenated blood is delivered to the __________ and then it passes into the __________ to be pumped to the entire body.
left atrium; left ventricle
The most muscular chamber of the heart is the __________.
left ventricle
What part of the heart is considered the systemic circuit pump?
left ventricle
During systemic circulation, blood leaves the __________.
left ventricle and goes directly to the aorta
When the mitral valve closes, it prevents the backflow of blood from the __________.
left ventricle into the left atrium
Match the following structure with its description: fibrous pericardium.
loosely fitting superficial part of the sac enclosing the heart
Which of the following would lead to a decrease in heart rate?
parasympathetic stimulation
The inner lining of the fibrous pericardium is formed by the __________.
parietal layer of serous pericardium
Match the following term with its correct description: aortic semilunar valve.
prevents backflow of blood into the left ventricle
Match the following term to its correct description: diastole.
relaxation
Match the area of the heart with the structure from which it receives blood: right ventricle.
right atrium
Match the given vessel with its correct 'destination': superior vena cava.
right atrium
The inferior vena cava brings blood from the lower regions of the body and empties into the __________.
right atrium
The tricuspid valve is located between the __________.
right atrium and right ventricle
Identify the correct sequence of blood flow through the chambers of the heart
right atrium, right ventricle, lungs, left atrium, left ventricle
Match the following term to its correct description: posterior interventricular artery.
runs to the apex of the heart
The role of the atrioventricular node (AV node) is to __________.
slow down impulses so that the atria can contract to fill the adjacent ventricles with blood
Match the following term with its correct description: brings oxygen-poor blood from the upper body to the right atrium.
superior vena cava
Match the following term to its correct description: anterior interventricular artery.
supplies blood to the interventricular septum and anterior walls of both ventricles
Match the following term to its correct description: right marginal artery.
supplies blood to the lateral right side of the myocardium
Match the following term to its correct description: circumflex artery.
supplies blood to the left atrium and posterior walls of the left ventricle
The cardiac cycle includes all of the following events EXCEPT __________.
the number of times the heart beats in one minute
Match the following term to its correct description: stroke volume.
the volume of blood pumped by one ventricle with each heartbeat
Match the following structure with its description: serous pericardium.
thin, slippery, two-layer membrane
Indicate the valve separating the following areas of the heart: right atrium and right ventricle.
tricuspid valve
Match the area of the heart with the "exit" through which the blood leaves: right atrium.
tricuspid valve
Match the following structure with its description: myocardium.
middle layer of the heart, composed mainly of cardiac muscle
Indicate the valve separating the following areas of the heart: left atrium and left ventricle.
mitral valve
The __________ nerve carries parasympathetic fibers to the sinoatrial (SA) node.
vagus
Match the following term with its correct description: mitral valve.
valve between the left atrium and left ventricle
Which of the following statements is NOT true about the shape, position, and location of the heart?
The heart is enclosed in a double-layered sac called the pleural membrane
Match the following term with its correct description: pulmonary semilunar valve
prevents backflow of blood into the right ventricle
Match the following term with its correct description: pulmonary semilunar valve.
prevents backflow of blood into the right ventricle
Indicate the valve separating the following areas of the heart: right ventricle and pulmonary trunk.
pulmonary semilunar trunk
Match the area of the heart with the "exit" through which the blood leaves: right ventricle.
pulmonary semilunar valve
Match the following term with its correct description: the right ventricle sends blood into this vessel.
pulmonary trunk
The endocardium is composed of __________.
simple squamous epithelium
Match the following term with its correct description: ventricular repolarization.
t wave
Match the following abbreviation with its definition: CO.
the amount of blood ejected from the heart in one minute
Match the following term to its correct description: cardiac output.
the amount of blood pumped by each ventricle in one minute
Cardiac output is __________.
the amount of blood pumped out of each ventricle in one minute
The absolute refractory period refers to the time during which __________.
the muscle cell is not in a position to respond to a stimulus of any strength