Human Physiology
15th Edition
ISBN: 9781259864629
Author: Fox, Stuart Ira
Publisher: Mcgraw-hill Education,
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Question
Chapter 14, Problem 3CP
Summary Introduction
To review:
Relation between venous return with stroke volume and cardiac output.
Introduction:
Frank-Starling law depicts the relationship between the strength of ventricular contraction, end diastolic volume, and the stroke volume. The end diastolic volume is the volume of the blood within the ventricles right in the beginning of the ventricular contraction and the stroke volume is the blood volume pumped by each ventricle per beat.
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When venous return remains constant, why would an increase in heart rate be expected to lead to a decrease in the force of contraction of the heart? Use the Frank-Starling Law to explain.
Frank-Starling law of the heart states:
if you increase the stretch of the cardiac muscle fibers you will decrease the force of contraction
a greater end diastolic volume will produce a weaker contraction of the ventricle
by increasing the force of ventricular contraction you will increase the end systolic volume
if you increase the stretch of the cardiac muscle fibers you will increase the force of contraction.
Explain the Frank-Starling Mechanism of the heart pumping.
Chapter 14 Solutions
Human Physiology
Ch. 14 - Prob. 1CPCh. 14 - Prob. 2aCPCh. 14 - Describe how the stroke volume is intrinsically...Ch. 14 - Define the terms preload and afterload and explain...Ch. 14 - Prob. 3CPCh. 14 - Prob. 4aCPCh. 14 - Define the term edema and describe four different...Ch. 14 - Prob. 5aCPCh. 14 - Prob. 5bCPCh. 14 - Prob. 5cCP
Ch. 14 - Prob. 6aCPCh. 14 - Prob. 6bCPCh. 14 - Prob. 7aCPCh. 14 - Prob. 7bCPCh. 14 - Define autoregulation and explain how this process...Ch. 14 - Describe blood flow and oxygen delivery to the...Ch. 14 - Prob. 9aCPCh. 14 - Describe the mechanisms that produce vasodilation...Ch. 14 - Prob. 9cCPCh. 14 - Define the term autoregulation and describe how...Ch. 14 - Prob. 10bCPCh. 14 - Prob. 11CPCh. 14 - Prob. 12aCPCh. 14 - Prob. 12bCPCh. 14 - Prob. 13aCPCh. 14 - Prob. 13bCPCh. 14 - Prob. 14CPCh. 14 - Prob. 15aCPCh. 14 - Prob. 15bCPCh. 14 - Prob. 15cCPCh. 14 - Prob. 16CPCh. 14 - Prob. 1RACh. 14 - In the absence of compensations, the stroke volume...Ch. 14 - Prob. 3RACh. 14 - Prob. 4RACh. 14 - Prob. 5RACh. 14 - Prob. 6RACh. 14 - Prob. 7RACh. 14 - The sounds of Korotkoff are produced by...Ch. 14 - Prob. 9RACh. 14 - Blood flow in the coronary circulation...Ch. 14 - Prob. 11RACh. 14 - Prob. 12RACh. 14 - Prob. 13RACh. 14 - Prob. 14RACh. 14 - Prob. 15RACh. 14 - Blood pressure is lowest in
Ch. 14 - Prob. 17RACh. 14 - Prob. 18RACh. 14 - Prob. 19RACh. 14 - The pulse pressure is a measure of
Ch. 14 - Define the terms contractilily, preload, and...Ch. 14 - Prob. 22RACh. 14 - Which part of the cardiovascular system contains...Ch. 14 - Prob. 24RACh. 14 - Prob. 25RACh. 14 - Prob. 26RACh. 14 - Prob. 27RACh. 14 - Prob. 28RACh. 14 - Prob. 29RACh. 14 - Prob. 30RACh. 14 - Prob. 31RACh. 14 - Prob. 32RACh. 14 - Prob. 33RACh. 14 - Prob. 34RACh. 14 - Prob. 35RACh. 14 - Prob. 36RACh. 14 - Prob. 37RACh. 14 - As described in chapter 8, functional magnetic...Ch. 14 - Prob. 39RACh. 14 - Athletes often have a slower resting cardiac rate...Ch. 14 - Prob. 41RACh. 14 - Prob. 42RACh. 14 - Prob. 43RACh. 14 - Prob. 44RACh. 14 - Prob. 45RACh. 14 - Prob. 46RA
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- Describe the Flank-Starling law in the heart. Describe how the heart alters stroke volume under sympathetic stimulation.arrow_forwardDescribe the Flank-Starling law in the heart.arrow_forwardDiscuss how the Frank-Starling law of the heart helps to explain the influence of venous return on stroke volume.arrow_forward
- Why is the Frank-Starling law of the heart important to the understanding of heart failure?arrow_forwardExplain the principle behind the Frank–Starling law of the heart. How does this mechanism normally prevent pulmonary or systemic congestion?arrow_forwardConsider the equation cardiac output (CO) = stroke volume (SV) X heart rate Which of the following changes would increase cardiac output? Group of answer choices An increase in afterload An increase in EDV A decrease in ventricle contractility An increase in parasympathetic system stimulation of the SA nodearrow_forward
- There are three major factors that affect stroke volume and therefore affect cardiac output: afterload, preload, and contractility. Select two of these factors and explain how and why each affects cardiac output.arrow_forwardDefine Starling law of the heartarrow_forwardDescribe the functional differences in the effects of the sympathetic and parasympathetic divisions of the autonomic nervous system on the activity of the heart.arrow_forward
- 29. 30. State the significance of the longer action potential in a cardiac CONTRACTILE cell. State why it is important to prevent tetany in a cardiac contractile cells?arrow_forwardDiagram electrical conduction of the heart and discuss each component (SA node, AV node, etc). How does this dictate the fluidity of heart contraction? Why does the SA always start the conduction? What is the inherent rate of depolarization of the SA node (this means that if the nervous system was shut off what would resting bpm be)? If it is damaged what happens to the electrical conduction system?arrow_forwardEstimate the volume of a human heart (in mL) using the following measurements/assumptions: Blood flow through the aorta is approximately 16.8 cm/s. The diameter of the aorta is approximately 3.0 cm. Assume the heart pumps its own volume with each beat. Assume a pulse rate of 90 beats per minute.arrow_forward
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