The region between the right and left pleural cavities is the
Pulmonary cavity
The heart chamber that receives oxygenated blood from the pulmonary veins.
left atrium
The heart chamber that receives blood from the superior vena cava, inferior vena cava, and coronary sinus.
Left atrium
Threadlike structures of the endocardium that prevent prolapse of the atrioventricular valves.
chordae tendineae
The valve responsible for preventing backflow of blood from the lungs into the heart.
Pulmonary semilunar valve
Contraction of these structures tightens the chordae tendineae, preventing valve prolapse.
Papillary muscles
Cells of the conducting system located between the AV node and bundle branches.
atrioventricular bundle
Large cardiac cells of the conducting system embedded in the ventricular walls between the endocardium and myocardim.
atrioventricular bundle
Parasympathetic impulses to the SA node are transmitted on this cranial nerve.
Vagus nerve
Death of heart musculature due to lack of oxygen.
myocardial infaction
The pericardial cavity lies between
the parietal pericardium and the visceral pericardium
The inner endothelial layer that line the heart is the
Which of the following vessels does not carry oxygen-poor blood to the heart?
the pulmonary vein
The superior corner of the right atrium of the heart is located at the
costal cartilage of the third rib whrere it attaches to the sternum.
The auricles are
earlike flaps on the surface of the atria
What structures anchor the choreae tendineae?
papillary muscles
Which of the following structures is not found in the left ventricle?
the pectinate muscles
The right ventricle pumps blood into which vessel?
the pulmonary trunk
A drop of blood returning to the heart from the head region would enter theheart through which vessel?
the superior vena cava
Semilunar valves are located
between the ventricles and the great arteries
What is the effect of the parasympathetic fibers carried by the vagus nerve?
They slow the heartbeat.
Which vessel returns most of the venous blood from the heart to the right atrium?
the coronary vein
During ventricular systole, blood is
forced from the ventricles into the aorta and pulmonary trunk
Blood within the pulmonary veins returns to the
left atrium
The term for pain caused by deficient blood delivery to the heart wall is
angina pectoris
Blood is carried to capillaries in the myocardium by way of the
coronary arteries
Which of the following veins does not deliver blood directly to the right atrium?
the great cardiac veins
Oxygen-poor blood returns to the heart and enters the
right atrium
The epicardium is the same as the
visceral layer of the serous pericardium
The heart chamber with the thickest wall is the
left ventricle
the heart chamber that pumps oxygenated blood around the systematic circuit is the
left ventricle
If the beating heart makes a lub-dup sound the dup sound is caused by
vibrations that result from the semilunar valves slamming shut
Of the three layers of the heart wall, the layer that contains the cardiac muscle is the
There is a foramen ovale in the skull and another one in the heart. The foramen ovale in the heart gives rise to the
fossa ovalis
the “heartstrings” are
chordae tendineae
The semilunar valves are closed when
the ventricles are relaxing
The atriventriclar node is located in the
inferior part of the interatrial septum.
The left ventricular wall of the heart is thicker than the right ventricular wall so that it can
pump blood with greater pressure
During left ventricular systole, blood exits the heart to enter the
The tricuspid valve is closed
when the ventricle is in systole
In the pericardial sac, the ____ lies directly deep to the fibrous pericardium.
parietal layer of the serous percardium
The cardiac centers that control heart rate are located in the
medulla oblongata of the brain stem
The correct sequence of heart wall layers from superficial to deep is epicardium, endocardium, and myocardium.
Papillary muscles are horizontal ridges in the walls of the atrium.
Oxygen-rich blood returning from the lungs enters the left atrium through two right and two left pulmonary veins.
Contraction of the hearts proceeds first on the right side of the heart and second on the left.
The electrical event that begins each heartbeat occurs at the sinoatrial node
Contraction of the ventricles begins at the apex and proceeds superiorly.
The right and left coronary arteries arise from the descending aorta.

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