Laboratory Manual for Anatomy & Physiology (6th Edition) (Anatomy and Physiology)
6th Edition
ISBN: 9780134206332
Author: Elaine N. Marieb, Lori A. Smith
Publisher: PEARSON
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Textbook Question
Chapter 17.5, Problem 12CYU
Describe the electrical event in the heart that occurs during each of the following: (a) the QRS wave of the ECG; (b) the T wave of the ECG; (c) the P-R interval of the ECG.
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Describe the electrical event in the heart that occurs during each of the following: (a) the QRS wave of the ECG; (b) the T wave of the ECG; (c) the P-R interval of the ECG.
Outline the flow of the electrical impulse through the conduction system of the heart by choosing the correct sequence from the drop-down menusFill the slots with the terms provided
(A) leads to (B) leads to (C) leads to (D) leads to (E)
Terms to use: Purkinje fibers
SA node
AV node and atrial contractile cells
Ventricular and contractile cells
right and left bundle branches
Select the TRUE statement/s:
During the isovolumetric contraction phase in the cardiac cycle,
OA) the SL valves are open
O B) the intraventricular pressure is increasing
O C) the intraventricular volume does not change
OD) Both A and C
OE) Both B and C
Chapter 17 Solutions
Laboratory Manual for Anatomy & Physiology (6th Edition) (Anatomy and Physiology)
Ch. 17.1 - The heart is in the mediastinum. Just what is the...Ch. 17.1 - From inside to outside, list the layers of the...Ch. 17.1 - What is the purpose of the serous fluid inside the...Ch. 17.2 - What is the function of the papillary muscles and...Ch. 17.2 - Prob. 5CYUCh. 17.3 - Which side of the heart acts as the pulmonary...Ch. 17.3 - Which of the following statements are true? (a)...Ch. 17.3 - Prob. 8CYUCh. 17.4 - For each of the following, state whether it...Ch. 17.5 - Cardiac muscle cannot go into tetany. Why?
Ch. 17.5 - Which part of the intrinsic conduction system...Ch. 17.5 - Describe the electrical event in the heart that...Ch. 17.5 - MAKING connections Below are drawings of three...Ch. 17.6 - The second heart sound is associated with the...Ch. 17.6 - If the mitral valve were insufficient, would you...Ch. 17.6 - During the cardiac cycle, there are two periods...Ch. 17.7 - Prob. 17CYUCh. 17.7 - What problem of cardiac output might ensue if the...Ch. 17 - When the semilunar valves are open, which of the...Ch. 17 - The portion of the intrinsic conduction system...Ch. 17 - An ECG provides information about (a) cardiac...Ch. 17 - The sequence of contraction of the heart chambers...Ch. 17 - The fact that the left ventricular wall is thicker...Ch. 17 - Prob. 6MCCh. 17 - In the heart, which of the following apply? (1)...Ch. 17 - The activity of the heart depends on intrinsic...Ch. 17 - Freshly oxygenated blood is first received by the...Ch. 17 - Describe the location and position of the heart in...Ch. 17 - Describe the pericardium and distinguish between...Ch. 17 - Trace one drop of blood from the time it enters...Ch. 17 - (a) Describe how heart contraction and relaxation...Ch. 17 - The refractory period of cardiac muscle is much...Ch. 17 - (a) Name the elements of the intrinsic conduction...Ch. 17 - Draw a normal ECG pattern. Label and explain the...Ch. 17 - Define cardiac cycle, and follow the events of one...Ch. 17 - What is cardiac output, and how is it calculated?Ch. 17 - Discuss how the Frank-Starling law of the heart...Ch. 17 - Prob. 1CCSCh. 17 - Prob. 2CCSCh. 17 - Prob. 3CCSCh. 17 - Prob. 4CCSCh. 17 - Prob. 5CCSCh. 17 - Prob. 6CCS
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- Clusters of neurons in the medulla oblongata that regulate blood pressure are known collectively as ________. baroreceptors angioreceptors the cardiomotor mechanism the cardiovascular centerarrow_forwardPressure changes that occur during the cardiac cycle are responsible for what two physiologic processes within the heart?arrow_forwardWhile the SA node is considered the pacemaker of the heart, the AV node is also capable of generating spontaneous action potentials, allowing it to serve as a “backup system” in case of SA node failure. If the SA node fails, how would you anticipate the baseline heart rate to change, and why is this the case?arrow_forward
- while a typical ECG tracing is shown, many things can alter and be perfectly normal for that individual. list some of the factors that change the standard tracing:.......?arrow_forwardIncreased contractility of the heart results in all of the following EXCEPT (A) increased stroke volume (B) increased force of contraction (C) increased end-systolic volume (D) increased venous returnarrow_forwardThe left AV valve has only two large leaflets, while the right AV valve has three smaller leaflets. It is a general principle of physiology that structure is a determinant of—and has coevolved with—function. Although it is unknown why the two valves differ in structure in this way, what difference in the functional demands of the left side of the heart might explain why there is one less valve leaflet than on the right side?arrow_forward
- The ST segment in the EKG is typically quiet and on the isoelectric line (like the T-P segment). What is happening during the ST segment in the EKG such that we see no waves? a) There is no electrical activity happening in the ventricles between the S and T waves b) The heart is relaxed and filling with blood c) The ST segment is representative of the plateau of the many ventricular action potentials happening at that point d) There is no longer Na+ influx during the ST segment so no waves are visible e) The ST segment is during ventricular repolarization and repolarization is not seen on the EKGarrow_forwardWhen the SA node doesn’t function properly, the AV node takes over pacing the heart and produces what is known as a junctional rhythm. Explain why we don’t see P waves on the ECG of an individual with such a rhythm?arrow_forwardWhich represents time for the passage of the electrical impulse through the atrium, causing atrial depolarization. Which represents time for depolarization of both ventricles. Which represents time for ventricular repolarization. Which represents the time taken for the entire electrical depolarization and repolarization of the ventricles. ["QRS complex", "T wave", "P wave" , "P-R interval", "QRS interval", "ST segment", "QT interval"arrow_forward
- Describe the functional differences in the effects of the sympathetic and parasympathetic divisions of the autonomic nervous system on the activity of the heart.arrow_forwardDescribe 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)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_forward
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