EBK HUMAN ANATOMY
9th Edition
ISBN: 9780135241752
Author: Marieb
Publisher: PEARSON CO
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Chapter 19, Problem 15RQ
Summary Introduction
To review:
The names of the elements involved in the heart’s conducting system starting with the pacemaker.
The presence or absence of nerves in the conducting system.
The functions of the conducting system.
Introduction:
An electrical impulse is generated and conducted by cardiac muscle cells, which are stimulated to contract in a rhythmic manner. These cardiac cells transmit impulse all around the heart muscle to start the contraction of the heart chamber in a sequential manner.
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During diastole, the chambers of the heart, (a) undergo a sharp increase in pressure. (b) contract and push blood into an adjacent chamber. (c) relax and fill with blood. (d) reach a pressure of approximately 120 mm Hg.
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Chapter 19 Solutions
EBK HUMAN ANATOMY
Ch. 19 - Prob. 1CYUCh. 19 - Prob. 2CYUCh. 19 - What is another name for the epicardium?Ch. 19 - Identify the heart chamber or chambers that...Ch. 19 - Prob. 5CYUCh. 19 - Prob. 6CYUCh. 19 - During ventricular systole, are the AV valves open...Ch. 19 - Differentiate a stenotic valve from an incompetent...Ch. 19 - What is the significance of the gap junctions in...Ch. 19 - What is the pacemaker of the heart, and where is...
Ch. 19 - Prob. 11CYUCh. 19 - Prob. 12CYUCh. 19 - Prob. 13CYUCh. 19 - How would incomplete formation of the...Ch. 19 - Which chamber of the heart is formed from the...Ch. 19 - What is the single most important factor for...Ch. 19 - The most external part of the pericardium is the...Ch. 19 - Prob. 2RQCh. 19 - How many cusps does the right atrioventricular...Ch. 19 - Prob. 4RQCh. 19 - Prob. 5RQCh. 19 - Prob. 6RQCh. 19 - Prob. 7RQCh. 19 - Prob. 8RQCh. 19 - Prob. 9RQCh. 19 - Which layer of the heart wall is the thickest? (a)...Ch. 19 - The inferior left corner of the heart is located...Ch. 19 - Ben was annoyed when his lab partner insisted that...Ch. 19 - Describe the location of the heart within the...Ch. 19 - Trace a drop of blood through all the heart...Ch. 19 - Prob. 15RQCh. 19 - Sketch the heart and draw all the coronary vessels...Ch. 19 - Prob. 17RQCh. 19 - Prob. 18RQCh. 19 - Make a drawing of the adult heart and the...Ch. 19 - How do the right and left ventricles differ...Ch. 19 - Which is more resistant to fatigue, cardiac muscle...Ch. 19 - Describe the structure and function of an...Ch. 19 - Compare and contrast the structure of cardiac...Ch. 19 - Classify the three congenital heart...Ch. 19 - Prob. 2CRCAQCh. 19 - Prob. 3CRCAQCh. 19 - After a man was stabbed in the chest, his face...Ch. 19 - A heroin addict felt tired, weak, and feverish....Ch. 19 - Another patient had an abnormal heart sound that...Ch. 19 - Prob. 7CRCAQCh. 19 - During a lethal heart attack, a blood. clot lodges...Ch. 19 - Prob. 9CRCAQ
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- CHOOSE ALL THAT APPLY ** The tricuspid valve is open A) while the ventricle is in diastole B) while the atrium is contracting C) by the movement of blood from atrium to ventricle D) when the mitral valve is openarrow_forward(a) Name the elements of the intrinsic conduction system of the heart in order, beginning with the pacemaker. (b) What is the important function of this conduction system?arrow_forward33.Please Identify the correct order of the blood flow pathway? (A) the pulmonary arteries carry oxygenated blood away from the pulmonary trunk (B) the left ventricle pushes blood through the aortic valve (C) the tricuspid valve takes blood from the left atrium to the left ventricle (D)superior vena cava, opening of coronary sinus, and inferior vena cava take blood to the left atriumarrow_forward
- The amount of blood forced out of the heart depends on the, (a) degree of stretching at the end of ventricular diastole. (b) contractility of the ventricle.(c) amount of pressure required to eject blood. (d) a, b, and c are correct.arrow_forwardWhich part of the conducting system of the heart is localized in the interventricular septum? (a) the atrioventricular node, (b) the sinoatrial node, (c) the atrioventricular bundle, (d) the Purkinje fibers.arrow_forwardDuring the cardiac cycle, when would you expect to hear the second heart sound? a) After ejection of blood into the aorta O b) Between the P wave and the QRS complex O C) When the AV valves close O d) When the AV valves are openarrow_forward
- Which of the following statements are true? (a) The left ventricle wall is thicker than the right ventricle wall. (b) The left ventricle pumps blood at a higher pressure than the right ventricle. (c) The left ventricle pumps more blood with each beat than the right ventricle. Explain.arrow_forwardIf an individual has a heart rate of 80 bpm; end diastolic volume of 140 ml and end systolic volume of 100 ml; calculate the cardiac output: OA) 8,000 ml B) 1,200 ml O. C) 3,200 ml OD) 4,000 ml O E) 6,000 mlarrow_forwardDuring isovolumetric ventricular contraction: a) all valves are open and pressure within the ventricles decreases. b) all valves are open and pressure within the ventricles increases. c) all valves are closed and pressure within the ventricles decreases. d) all valves are closed and pressure within the ventricles increases.arrow_forward
- Key Label the parts of the heart Blood flow h). d) aorta right atrium right ventricle inferior vena cava pulmonary artery left atrium right ventricle | superior vena cava g) f)arrow_forwardIf the vagal nerves to the heart were cutthe result would be that A) the heart would stop, since the vagal nerves trigger the heart to contract B) the AV node would become the pacemaker of the heart D) the heart rate would not be affected E) the heart rate would increasearrow_forward) The blood that remains in the ventricles at the end of ejection is called the residual volume and is typically about sSomL. Congestive heart failure is caused by ventricle. This could result in all of the tollowing excepti al Pulinonary edema b) decreased aortic reduced pumping etficieney of of the left pressure and blood flow. c) right ventricolar failure dl congestion of blood in e) residual volume the pulmonary artery. less than soml. a small hydropho bie molecule that can the freely diff 2) Carbon dieride acress plama membranes. Excess corbon dioxi de provides drive for respiration ,primarily arterial PCO, would cause all ot the following changes except8 al į PCOa in the cerebrespinad fluid b) v HCO; reabsorption by the Kidney a ↑ plas ma pH ↑ HCO; transport out of the cerebrospimal fluid e) fuster ventilution rate ) Alcohol inhibits the productien of ADH A person who has consumed alcohol would have: al J urine outp.t, blood osmolarity A Turine output bloed osmolarity is primary…arrow_forward
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