Anatomy & Physiology (6th Edition)
6th Edition
ISBN: 9780134156415
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Chapter 17, Problem 19SAQ
Discuss how the Frank-Starling law of the heart helps to explain the influence of venous return on stroke volume.
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Discuss how the Frank-Starling law of the heart helps to explain the influence of venous return on stroke volume.
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.
There are three major factors that affect stroke volume and therefore affect cardiac output: afterload, preload, and contractility. Explain how and why each of these factors affects cardiac output. Each answer must explain what the factor is as well as how it affects cardiac output.
Chapter 17 Solutions
Anatomy & Physiology (6th Edition)
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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- Potassium deficiency can result in irregular heart rhythms including bradycardia (slow heart rate), ventricular tachycardia (rapid ventricular systole), and ventricular fibrillation (asynchronous ventricular depolarization resulting in disorganized cardiac electrical activity). How would you expect ventricular tachycardia to impact stroke volume?arrow_forwardName three mechanisms that can increase cardiacoutput.arrow_forwardExplain the Frank-Starling law of the heartarrow_forward
- Assume that one ventricle of a child’s heart has an EDV of 90 mL, an ESV of 60 mL, and a cardiac output of 2.55 L/min. What are the child’s stroke volume (SV), ejection fraction (EF), and heart rate (HR)?a. SV = 60 mL; EF = 33%; HR = 85 bpmb. SV = 30 mL; EF = 60%; HR = 75 bpmc. SV = 150 mL; EF = 67%; HR = 42 bpmd. SV = 30 mL; EF = 33%; HR = 85 bpme. Not enough information is given to calculate these.arrow_forwardFrank-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.arrow_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
- What is the function of the pulmonary circulation In a resting state, explain what happened to the heart rate when the stroke volume decreased. Why does this occur? DescribetheFlank-Starlinglawintheheart. Compare the structural features of the different chambers and valves of the heart and how this relates to their function. Explain the flow of the blood as it passes through the heart. Describe how the heart alters stroke volume under sympathetic stimulation. please answer the queations into 2 paragraphs. thanks.arrow_forwardWhy is exercise heart rate crucial during cardiovascular exercise and how does this affect treatment?arrow_forwardDraw these five graphs on the same set of axes: atrial autorhythmic cell action potential atrial cardiac contractile cell action potential ventricular autorhythmic cell action potential ventricular cardiac contractile cell action potential ventricular myocardial muscle tensionarrow_forward
- What is cardiac output? How do you anticipate increased heart rate to impact stroke volume? Briefly explain your answer by outlining the impact of heart rate on the phases of the cardiac cycle.arrow_forwardDefine the term 'distributive shock' and briefly explain why two of the three types of distributive shock result in increased heart rate, whilst the third type results in decreased heart rate.arrow_forwardGive a detailed mechanism of action of a name drug or agonist that results in positive inotropic changes in the cardiac cell.arrow_forward
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