UNIT 9: Heart
Coronary _____ branch from the ascending aorta to supply the ventricles and atria, and coronary _____ drain blood into the right atrium.
Arteries, veins
Which of the following is the correct order of the heart wall layers, from outermost to innermost?
Epicardium, myocardium, endocardium
Which of the following statements accurately describes how oxygenated blood leaves the heart?
It flows from the left atrium into the left ventricle, which pumps it through the aortic valve into the ascending aorta.
Which of the following statements accurately explains how deoxygenated blood leaves the heart?
It flows from the right atrium into the right ventricle, which pumps it through the pulmonary valve into the pulmonary trunk.
What is the function of the myocardium?
It produces the heart's strong and continuous pumping action.
The right and left ventricles contain _____ muscles, which contract to pull on the chordae tendineae. The purpose of the chordae tendineae is to _____.
Papillary, prevent inversion of the heart valves
The thin sac that surrounds the heart is called the _____, and its function is _____.
Pericardium, enclosing and protecting the heart
Which of the following statements accurately describes pulmonary circulation?
Pulmonary circulation delivers deoxygenated blood from the heart to the lungs and oxygenated blood from the lungs to the heart.
_____ veins carry oxygen-rich blood, whereas _____ arteries carry oxygen-poor blood.
Pulmonary, pulmonary
The _____ receives oxygen-depleted blood and empties it into the _____, whereas oxygenated blood from the lungs enters the _____ and empties into the _____.
Right atrium, right ventricle, left atrium, left ventricle
Which of the following accurately lists the structures through which electrical impulses pass, from initiation to culmination?
Sinoatrial node, atrioventricular node, bundle of His, bundle branches, Purkinje fibers
If a friend asked you to describe the spatial relationship among the heart, lungs, and diaphragm, which of the following would you most likely say?
The heart is located between the lungs and superior to the diaphragm.
Which of the following structures separates the right and left ventricles?
The interventricular septum
All of the following structures deliver deoxygenated blood to the right atrium except
The pulmonary veins.
Which of the following statements accurately compares the functions of the right and left ventricles?
The right ventricle pumps deoxygenated blood into the pulmonary trunk, whereas the left ventricle pumps oxygenated blood into the ascending aorta.
Which of the following statements accurately describes a difference between the right and left ventricles?
The walls of the left ventricle are about three times thicker than those of the right ventricle.
