Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 44, Problem 2TYU
Summary Introduction
Introduction: The heart is the main organ of the circulatory system that pumps blood to all the tissues of the body. Sinoatrial node (SA node) is a group of cells located at the right atrium of the heart. SA node is also referred to as the pacemaker of the heart.
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The structure marked by the white arrow
(A) is found between the right and left ventricles
(B) is found between the right and left atria
(C) closes before birth
(D) A and C
(E) B and C
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.
As a result of ventricular depolarization (T wave), calcium ions are returned to the sarcoplasmic reticulum and ventricular muscles relax. As the myocardium relaxes, the semilunar valves close. At this time which of the following is true?
Group of answer choices
(A) ventricular pressure > aortic pressure > atrial pressure
(B) atrial pressure > ventricular pressure > aortic pressure
(C) aortic pressure > ventricular pressure > atrial pressure
(D) aortic pressure > atrial pressure > ventricular pressure
Chapter 44 Solutions
Biology (MindTap Course List)
Ch. 44.1 - Types of Circulatory Systems Contrast internal...Ch. 44.1 - Compare how oxygen is transported to the body...Ch. 44.1 - Prob. 2CCh. 44.1 - What are five functions of the vertebrate...Ch. 44.2 - Prob. 2LOCh. 44.2 - Summarize the sequence of events involved in blood...Ch. 44.2 - Prob. 1CCh. 44.2 - Prob. 2CCh. 44.2 - Prob. 3CCh. 44.3 - Prob. 4LO
Ch. 44.3 - Prob. 1CCh. 44.3 - Prob. 2CCh. 44.4 - Prob. 5LOCh. 44.4 - Prob. 1CCh. 44.5 - Prob. 6LOCh. 44.5 - Prob. 7LOCh. 44.5 - Prob. 8LOCh. 44.5 - Prob. 1CCh. 44.5 - PREDICT A patients mitral valve (left AV valve)...Ch. 44.5 - Prob. 3CCh. 44.6 - Prob. 9LOCh. 44.6 - Prob. 1CCh. 44.6 - Prob. 2CCh. 44.7 - Prob. 10LOCh. 44.7 - Prob. 1CCh. 44.7 - Prob. 2CCh. 44.8 - Prob. 11LOCh. 44.8 - Prob. 1CCh. 44.8 - Prob. 2CCh. 44.9 - Trace the progression of atherosclerosis and...Ch. 44.9 - Prob. 1CCh. 44.9 - Prob. 2CCh. 44 - Which of the following are most closely associated...Ch. 44 - Prob. 2TYUCh. 44 - Prob. 3TYUCh. 44 - Prob. 4TYUCh. 44 - Prob. 5TYUCh. 44 - Prob. 6TYUCh. 44 - Prob. 7TYUCh. 44 - Prob. 8TYUCh. 44 - Test Your Understanding 9. VISUALIZE Draw a simple...Ch. 44 - Prob. 10TYUCh. 44 - Prob. 11TYUCh. 44 - Prob. 12TYUCh. 44 - Test Your Understanding 13. SCIENCE, TECHNOLOGY,...
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- 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_forwardWhich of the following statements is true about the SA (sinoatrial) node? a. The action potential created by the pacemaker cells of the SA node directly stimulates the contractile cells of both the atria and ventricles. b. The rate of spontaneous depolarization of nodal cells is the fastest in the SA node. c. Pacemaker cells in the SA node form a pathway between the SA and AV nodes. d. The pacemaker cells, which establish the heart rate, are located only in the SA node.arrow_forwardthe cardiac cycle (More than one answer may be correct. Choose all that apply) a.) stroke volumes are around 70 – 80 ml b.) ventricular volumes are at a minimum at the beginning of diastole c.) ventricular volumes are at a minimum at the end of isovolumetric contraction d.) ventricular volumes are at a minimum just prior to atrial systole e.) ventricular volumes are at a minimum when both atrioventricular and semilunar valves are closedarrow_forward
- (i)List the major blood vessels and their origins involved in coronary circulation.(ii) At what stage or phase of the heart’s activities does the heart tissues becomes perfused with oxygenated blood? (iii) Define myocardial infarction.(iv) Explain the typical signs associated with acute myocardial infarction. (v) Outline/State which arteries of the heart are most commonly affected/occluded.(vi) Explain why occlusions lead to infarct in the heart.arrow_forwardDuring this experimental activity (effect of stroke volume), the flow rate stayed constant because (A) the vessel radii are not changing (B) stroke volume is equivalent to blood flow (C) the end-systolic volume is not changing (D) cardiac output is equivalent to blood flowarrow_forwardWhich of the following cardiac tissues has the most rapid conduction velocity? A)The AV node. B) Purkinje fibers. C) The bundle branches. D) Papillary muscles. E) The ventricular.arrow_forward
- (a) Name the type of blood vessel labelled (i) C. (ii) D. (b) In which direction does blood in vessel A travel? (c) Which of the four blood vessels contains the most oxygen? (d) What happens to the amount of oxygen in the blood as it passes through the body organs? (e) What is the chamber of the heart labelled X? ·arrow_forwardList the major blood vessels and their origins involved in coronary circulation. (ii) At what stage or phase of the heart’s activities does the heart tissues becomes perfused with oxygenated blood? (iii) Define myocardial infarction. (iv) Explain the typical signs associated with acute myocardial infarction. (v) Outline/State which arteries of the heart are most commonly affected/occluded. (vi) Explain why occlusions lead to infarct in the heart. (vii) What is creatine phosphokinase (CPK) and why are elevated CPK levels in the blood suggestive of a myocardial infarction? (viii) What is cor pulmonale? (ix) Describe the main clinical findings (with cor pulmonale) on examination. Explain your answer.arrow_forwardIn a healthy adult blood flow in the left coronary artery is less during systole than diastole. This difference is best explained by a change in which of the following (a) Coronary arterial Po2 (b) Extravascular Pressure (c) Flow through the aortic valve (d) Parasympathtic nerve activity (e) Sympathetic nerve activityarrow_forward
- Why is it necessary to stimulate papillary muscles in the ventricle slightly earlier than the rest of the ventricular wall myocardium? a. to assure rapid conduction speed of the action potential b. to pull on AV valve cusps to prevent backflow c. to assure blood will surge toward the semilunar valves d. to assure coordinated contraction of the ventricular myocardiumarrow_forwardAll of the following mechanisms assist in returning venous blood to the heart except: a. an increase in heart rate b. pressure changes in the abdominal and thoracic cavities due to breathing c. contraction of skeletal muscles in the legs d. one-way valves located inside veinsarrow_forwardIn the cardiovascular dynamics experiment (part 2), if the right beaker simulates the flow of blood to the systemic circuit of the body, what do the right valve and flow tube represent? Select one: aortic valve and pulmonary veins bicuspid valve and pulmonary veins aortic valve and aorta bicuspid valve and aortaarrow_forward
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