LooseLeaf for Human Anatomy
5th Edition
ISBN: 9781259285271
Author: Michael McKinley Dr., Valerie O'Loughlin, Elizabeth Pennefather-O'Brien
Publisher: McGraw-Hill Education
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Chapter 22, Problem 10CR
Summary Introduction
To describe:
The phases of the cardiac cycle.
Introduction:
A cardiac cycle includes all the events within the heart from the start of one heartbeat to the initiation of the next. During a single cardiac cycle, all chambers within the heart experience alternate periods of contraction and relaxation. The contraction of a heart chamber is called systole. The relaxation phase of a heart chamber is called diastole.
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Describe the mechanical events of the cardiac cycle. (use terms like atrial systole, atrial diastole, ventricular diastole, ventricular systole, isovolumic ventricular contraction, isovolumic ventricular relaxation, ventricular ejection, period of rapid filling)
What are the phases of the cardiac cycle? Describe each phasewith respect to which heart chambers are in systole or diastole,which valves are open or closed, and blood flow into or out ofthe chambers.
Complete the table below to describe what happens with the blood flow, volume, and pressure
during the four phases of the cardiac cycle. Which valves open/close during these phases?
Ventricular
Isovolumetric
Ventricular
Isovolumetric
Filling
Contraction
Ejection
Relaxation
Blood Flow
Low
Ventricular
Volume
Ventricular
Pressure
Aortic Pressure
Chapter 22 Solutions
LooseLeaf for Human Anatomy
Ch. 22 - What is the basic distinction between arteries and...Ch. 22 - Prob. 2WYLCh. 22 - Prob. 3WYLCh. 22 - Identify the layers of the pericardium. Why is the...Ch. 22 - Prob. 5WYLCh. 22 - What are two similarities and two differences...Ch. 22 - What is the composition and function of the...Ch. 22 - Prob. 8WYLCh. 22 - Prob. 9WYLCh. 22 - Prob. 10WYL
Ch. 22 - Prob. 11WYLCh. 22 - Prob. 12WYLCh. 22 - Prob. 13WYLCh. 22 - What events occur in the ventricles during late...Ch. 22 - Prob. 15WYLCh. 22 - Match each numbered item with the most closely...Ch. 22 - Prob. 1MCCh. 22 - Prob. 2MCCh. 22 - Prob. 3MCCh. 22 - Prob. 4MCCh. 22 - Prob. 5MCCh. 22 - In the developing heart, the atria form from the...Ch. 22 - The irregular muscular ridges in the ventricular...Ch. 22 - Prob. 8MCCh. 22 - Prob. 9MCCh. 22 - The thickest part of the heart wall is the a....Ch. 22 - What are the differences between the pulmonary and...Ch. 22 - Prob. 2CRCh. 22 - Prob. 3CRCh. 22 - Where is the fibrous skeleton of the heart...Ch. 22 - Prob. 5CRCh. 22 - Prob. 6CRCh. 22 - Identify and compare the branches of the right and...Ch. 22 - Compare cardiac and skeletal muscle. In what ways...Ch. 22 - Prob. 9CRCh. 22 - Prob. 10CRCh. 22 - It was the end of the semester, and Huang had...Ch. 22 - Prob. 2DCR
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- In the figure below on the left, label the P, QRS and T waves. Describe what is happening in the heart in the P wave: Relate the P wave to the cardiac cycle:o Is the heart in systole or diastole?o Is the pressure high or low?o Where is blood flowing? Which valves are open? closed? o Which muscle fibers are contracting, if any?arrow_forwarda)How is one-way flow through the heart achieved and What are the stages of the cardiac cycle and the changes in pressure that occur in thechambers?b)Define how cardiac output is calculated, and what it can tell you about heart function. c. What factors influence cardiac output to maintain adequate perfusion?arrow_forwardWhere is the pacemaker of the heart located? What is it called? Trace the path of electrical excitation from there to a cardiomyocyte of the left ventricle, naming each component of the conduction system along the way.arrow_forward
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- Which of the following is/are true concerning the opening and closing of the cardiac valves? valves operate according to the pressures on either side of the valve valve operation is constantly being controlled by the medulla oblongata valve operation is determined directly by the cardiac action potential (electrical currents control the opening and closing of the valves.) valve operation is directly controlled by the papillary muscles within the ventricular wall. None of the above is correct.arrow_forwardDescribe the general overall shape of the left and right cavities of the ventricles as observed in a transverse section of the heart.arrow_forwardDescribe the cardiac cycle and the relationship amongthe contraction of each of the chambers, the opening andclosing of valves, the pressure in each of the chambers,the phases of the electrocardiogram, and the heartsounds.arrow_forward
- Define each of the following external features of the heart: auricle, coronary sulcus, anterior interventricular sulcus, and posterior interventricular sulcus.arrow_forwardDescribe the cardiac cycle and the cardiac conduction system.arrow_forwardThe cardiac cycle includes all the events associated with the flow of blood through the heart during a single complete heartbeat. Indicate if the following statements are True/False. When ventricular pressure exceeds atrial pressure, the atrioventricular valves open.arrow_forward
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