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 3TYU
Summary Introduction
Introduction: The heart is the main organ of the circulatory system that transports the blood to all parts of the body. The repetitive cycle of contraction and relaxation of the heart is termed as the cardiac cycle. The complete cycle of one heartbeat forms a cardiac cycle. The cardiac cycle is represented as “number of heartbeats in one minute”.
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Increased contractility of the heart results in all of the following EXCEPT
(A) increased stroke volume
(B) increased force of contraction
(C) increased end-systolic volume
(D) increased venous return
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
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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- Outline the flow of the electrical impulse through the conduction system of the heart by choosing the correct sequence from the drop-down menusFill the slots with the terms provided (A) leads to (B) leads to (C) leads to (D) leads to (E) Terms to use: Purkinje fibers SA node AV node and atrial contractile cells Ventricular and contractile cells right and left bundle branchesarrow_forwardDoes the human heart spend more time in diastole or more time in systole (assume a heart rate of 72 beats per minute)? Of what benefit is this?arrow_forward(i) A scene of a TV drama showed that a heart continues to beat when it was ripped from a brain-dead patient. Is that possible? Elaborate your answer.arrow_forward
- The aorta is the principal blood vessel through which blood leaves the heart in order to circulate around the body. (a) Calculate the average speed of the blood in the aorta if the flow rate is 5.0 L/min. The aorta has a radius of 10 mm. (b) Blood also flows through smaller blood vessels known as capillaries. When the rate of blood flow in the aorta is 5.0 L/min, the speed of blood in the capillaries is about 0.33 mm/s. Given that the average diameter of a capillary is 8.0 μm (1 μm = 1 X 10 –6 m), calculate the number of capillaries in the blood circulatory system.arrow_forwardThe heart’s internal pacemaker beats by: a. an internal implant that sends an electrical impulse through the heart b. the excitation of cardiac muscle cells at the sinoatrial node followed by the atrioventricular node c. the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node d. the action of the sinusarrow_forwardA 'pulse deficit' (A) is determined by subtracting the value of the apical pulse from the radial pulse (B) is determined by subtracting the radial pulse from the apical pulse (C) may be caused by atrial fibrillation (D) may be caused by multiple premature ventricular contractions (E) A and C (F) B, C, and Darrow_forward
- It is generally accepted that a relatively low diastolic vascular pressure is more important than a relatively low systolic vascular pressure because: A. diastolic vascular pressure is the pressure that determines the length of diastole. B. diastolic vascular pressure directly determines stroke volume. C. diastolic vascular pressure ultimately determines and controls contractility. D. diastolic vascular pressure is a force the heart must compete with to open the aortic valve.arrow_forwardSelect the TRUE statement/s: During the isovolumetric contraction phase in the cardiac cycle, OA) the SL valves are open O B) the intraventricular pressure is increasing O C) the intraventricular volume does not change OD) Both A and C OE) Both B and Carrow_forwardThe function of structure X is to Select one: a. act as the pacemaker of the heart. b. initiate the atrial contraction. c. open the atrioventricular (AV) valve when stimulated by an electrical impulse. d. prevent the atrioventricular (AV) valve from inverting.arrow_forward
- All 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_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_forwardBlood pressure can be significantly affected by (a) cardiac output (b) peripheral resistance (c) blood volume (d) a, b, and c (e) a and b onlyarrow_forward
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