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Ch. 18 The Cardiovascular System: The Heart
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All textbooksMarieb, Hoehn 7th EditionCh. 18 The Cardiovascular System: The HeartProblem 4

Chapter 17, Problem 4

The sequence of contraction of the heart chambers is a. random, b. left chambers followed by right chambers, c. both atria followed by both ventricles, d. right atrium, right ventricle, left atrium, left ventricle.

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Hi, everybody. Let's look at our next question. It says which of the following definitions of the heart cycle is correct. Choice. A it is a sequence of events that occur in the heart during one complete heartbeat. B is the sequence of events that occur in the heart during one pulmonary circulation. C is a sequence of sequence of events that occur in the heart during one systemic circulation or D. It is a sequence of events that occur in the heart between two complete circulations. Well, the proper definition of the heart cycle is choice. A, the sequence of events that occur in the heart during one complete heartbeat. So including contraction and relaxation phases of the heart chambers. If we look at our other answer, choices, they all refer to blood circulating through a certain part of the body. So in choice B, it says the sequence of events that occur in the heart during one pulmonary circulation. So blood circulating up out of the heart through the lungs and back to the heart. But that's not the correct definition. And then C says occurs in the heart during one systemic circulation, systemic circulation would be blood coming out of the heart through the body and back to the heart. But that is also not the definition of a heart cycle. And finally, in choice d sequence of events that occur in the heart between two complete circulations. So blood circulating completely out of the heart through the lungs, back to the heart, out through the body and back to the heart, but again, not correct. So heart cycle is not defined by where the blood is circulating, but the actual what's going on in the heart muscle itself. So one complete heartbeat, contraction and relaxation phases of those heart chambers. So choice a complete heartbeat is our correct definition of a heart cycle. See you in the next video.
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