![FUNDAMEN OF ANATOMY + PHYSIOLOGY + MAST](https://www.bartleby.com/isbn_cover_images/9780136782261/9780136782261_largeCoverImage.gif)
FUNDAMEN OF ANATOMY + PHYSIOLOGY + MAST
11th Edition
ISBN: 9780136782261
Author: Martini
Publisher: INTER PEAR
expand_more
expand_more
format_list_bulleted
Question
Chapter 20, Problem 31RQ
Summary Introduction
To determine:
The effect of the drug Verapamil, on Karen’s stroke volume.
Introduction:
The stroke volume denoted as SV refers to the amount of blood that is pumped out of a ventricle at the time of every contraction. Contractility is defined as the amount of force that is formed at the time of contraction, at preload. Contractility, under normal conditions can be altered by the circulating hormones and autonomic innervations or drugs. Verapamil is one of the drugs that block the calcium ion channels in the cardiac cells.
Expert Solution & Answer
![Check Mark](/static/check-mark.png)
Want to see the full answer?
Check out a sample textbook solution![Blurred answer](/static/blurred-answer.jpg)
Students have asked these similar questions
Why can acetylcholine cause an increase in stroke volume?
I need to calculate the approximate heart rate based on the given ECG results, but I can't get how to determine the length of time between two consecutive R waves. What I see, it's one second between the two highest waves (I suppose they are R waves). But it means the heart rate should be 60 beats per minute, but there is no option for this answer. Teach me how to determine correctly the length of time between two consecutive R waves.
Why is it possible for acetylcholine to actually cause an increase in stroke volume, even though increased parasympathetic activity causes an overall decrease in cardiac output?
Chapter 20 Solutions
FUNDAMEN OF ANATOMY + PHYSIOLOGY + MAST
Ch. 20 - Prob. 1CPCh. 20 - Prob. 2CPCh. 20 - Why is the left ventricle more muscular than the...Ch. 20 - Define autorhythmicity.Ch. 20 - Which structure of the heart is known as the...Ch. 20 - Prob. 6CPCh. 20 - Why is it important for impulses from the atria to...Ch. 20 - Give the technical terms for heart contraction and...Ch. 20 - List the phases of the cardiac cycle.Ch. 20 - Is the heart always pumping blood when pressure in...
Ch. 20 - What could cause an increase in the size of the...Ch. 20 - Define cardiac output.Ch. 20 - Prob. 13CPCh. 20 - Prob. 14CPCh. 20 - Prob. 15CPCh. 20 - Prob. 16CPCh. 20 - Prob. 17CPCh. 20 - The great cardiac vein drains blood from the heart...Ch. 20 - The autonomic centers for cardiac function are...Ch. 20 - Prob. 3RQCh. 20 - The simple squamous epithelium covering the heart...Ch. 20 - The heart is surrounded by the (a) pleural cavity,...Ch. 20 - The cardiac skeleton of the heart has which two of...Ch. 20 - Cardiac output is equal to the (a) difference...Ch. 20 - Identify the superficial structures in the...Ch. 20 - Identify the structures in the following diagram...Ch. 20 - During diastole, a chamber of the heart (a)...Ch. 20 - During the cardiac cycle, the amount of blood...Ch. 20 - What role do the chordae tendineae and papillary...Ch. 20 - Describe the three distinct layers that make up...Ch. 20 - What are the valves in the heart, and what is the...Ch. 20 - Trace the normal pathway of an electrical impulse...Ch. 20 - What is the cardiac cycle? What phases and events...Ch. 20 - What three factors regulate stroke volume to...Ch. 20 - The cells of the conducting system differ from the...Ch. 20 - Which of the following is longer? (a) the...Ch. 20 - If the papillary muscles fail to contract, (a) the...Ch. 20 - Cardiac output cannot increase indefinitely...Ch. 20 - Describe the function of the SA node in the...Ch. 20 - What are the sources and significance of the four...Ch. 20 - Differentiate between stroke volume and cardiac...Ch. 20 - What factors influence cardiac output?Ch. 20 - What effect does sympathetic stimulation have on...Ch. 20 - Describe the effects of epinephrine,...Ch. 20 - Vern is suffering from cardiac arrhythmias and is...Ch. 20 - Harvey has a heart murmur in his left ventricle...Ch. 20 - The following measurements were made on two...Ch. 20 - Prob. 31RQCh. 20 - Prob. 1CCCh. 20 - Prob. 2CC
Knowledge Booster
Similar questions
- Roberto is a 78-year-old male who has recently been diagnosed with Class III Congestive Heart Failure (CHF). His physician told him that his left ventricle has become stiff and cannot relax. Although there is no current treatment that can “fix” Roberto’s condition, he is prescribed two medications: an ACE inhibitor and beta blockers.Briefly describe how ACE-inhibitors will influence Roberto’s heart function.arrow_forwardRoberto is a 78-year-old male who has recently been diagnosed with Class III Congestive Heart Failure (CHF). His physician told him that his left ventricle has become stiff and cannot relax. Although there is no current treatment that can “fix” Roberto’s condition, he is prescribed two medications: an ACE inhibitor and beta blockers. Which of these statements is most likely true of Roberto’s current symptoms? He doesn’t experience any symptoms at all at rest or during exercise. He has no symptoms at all during rest, but experiences palpitations, fatigues, and shortness of breath during mild exercise. He experiences fatigue, shortness of breath, and palpitations at rest and is not able to participate in any physical activity.arrow_forwardRoberto is a 78-year-old male who has recently been diagnosed with Class III Congestive Heart Failure (CHF). His physician told him that his left ventricle has become stiff and cannot relax. Although there is no current treatment that can “fix” Roberto’s condition, he is prescribed two medications: an ACE inhibitor and beta blockers.Briefly describe how beta-blockers will influence Roberto’s heart function, specifically the physiology of the ventricles.arrow_forward
- Roberto is a 78-year-old male who has recently been diagnosed with Class III Congestive Heart Failure (CHF). His physician told him that his left ventricle has become stiff and cannot relax. Although there is no current treatment that can “fix” Roberto’s condition, he is prescribed two medications: an ACE inhibitor and beta blockers. Briefly describe how beta-blockers will influence Roberto’s heart function, specifically the physiology of the ventricles.arrow_forwardRoberto is a 78-year-old male who has recently been diagnosed with Class III Congestive Heart Failure (CHF). His physician told him that his left ventricle has become stiff and cannot relax. Although there is no current treatment that can “fix” Roberto’s condition, he is prescribed two medications: an ACE inhibitor and beta blockers. Which of the following conditions may have led to Roberto’s CHF? Faulty heart valves Hypertension Myocarditis Prior heart attacks All of these choices are correct.arrow_forwardThere 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_forward
- Having been lost in the desert for 2 days without water, Robert is badly dehydrated. What would be the impact on his stroke volume, heart rate and mean arterial pressure? Explain reasoning for each.arrow_forwardMolly Carpenter, a 44-year-old female client,is admitted with an embolic stroke, and the cardiologist ordered a transesophageal echocardiogram (TEE). The client refused to sign the informed written consent when the cardiologist presented it to the client. The client has a shaky voice, she complains of palpitations, and there is visible diaphoresis present on Molly’s forehead. Molly is pacing back and forth in the room and her eyes are dilated. The vital signs include T, 98°F; BP, 140/90 mmHg; HR, 110 beats/minute; RR, 28 breaths/minute. The cardiologist talked with the client, stating that the test needs to be done to clearly find out if there are any blood clots in the heart that could travel and cause a future stroke. The client recognizes the test is needed but stated she is freaked out by the thought of a tube being shoved down her throat. The LPN/LVN needs to provide nursing interventions to reduce Molly’s anxiety so she can learn more about the TEE and comfort measures that will…arrow_forwardSelect the best answer or answers from the choices given: In the heart, which of the following apply? (1) Action potentials are conducted from cell to cell across the myocardium via gap junctions, (2) the SA node sets the pace for the heart as a whole, (3) spontaneous depolarization of cardiac cells can occur in the absence of nerve stimulation, (4) cardiac muscle can continue tocontract for long periods in the absence of oxygen. (a) all of the above, (b) 1, 3, 4, (c) 1, 2, 3, (d) 2, 3.arrow_forward
- While preparing for a class presentation, Brandon drinks 10 cups of coffee, What would be the impact on his stroke volume, heart rate and mean arterial pressure? Explain your reasoning for each.arrow_forwardWhat effect does a drug have that block the calcium channel in a cardiac muscle cells? What is the direct effect on the stroke volume?arrow_forwardWhy is hypertension such a serious problem?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you