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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Students have asked these similar questions
If the pressure in the ventricles is higher than the pressure in the atria, but lower than the pressure in the great arteries, which of the following is true?
a-semilunar valves will be closed, but the atrioventricular valves will be open, ventricles will be filling
b-both the atrioventricular and semilunar valves will be closed and there will be no flow of blood
c-both the atrioventricular and semilunar valves will be open and there will be flow through the ventricles
d-the atrioventricular valves will be closed, but the semilunar valves will be open, ventricles will be ejecting blood
What anatomical feature prevents the electrical signal from traveling directly from atrial muscle to ventricular muscle?
Why would a fourth chamber heart be evolutionarily advantageous to an animal?
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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- What is the consequence of the prolonged plateau of depolarization in ventricular myocytes? a-it causes ventricular myocytes to contract for a longer time, allowing the ventricles time to empty b-it gives additional time for the atria to contract, filling the ventricles more completely c-it causes repolarization to be delayed which slows heart rate d-it allows the ventricles a moment to rest before completing contractionarrow_forwardWhich one of the following is a matching pair? A Pulsation of the radial artery - values in the blood vessels B Dup - Sudden opening of semilunar valves at the beginning of ventricular diastole C Lubb - Sharp closure of AV valves at the beginning of ventricular systole D Initiation of the heart beat - Purkinje fibresarrow_forwardWhich 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_forward
- Which of the choices below best describes the systemic circulation of blood?a. The flow of blood into the right atrium and eventually out of the left ventricle.b. The movement of blood from the pulmonary trunk, through capillaries into the pulmonary veins.c. The movement of blood into the coronary arteries, through capillaries into the coronary sinus.d. The movement of blood from the aorta, through arteries and capillaries and then eventually to the vena cavae.arrow_forwardDuring a cardiac angiogram, it is discovered that a 58-year-old patient has moderate stenosis of the left circumflex artery. Which chamber of the heart would be impacted by this blockage?arrow_forwardWe analyzed the difference between the action potential of a cardiac contractile cell and an action potential in a neuron. Describe the physiological mechanisms behind the primary difference in the shape of these two action potentials. Why is this feature important to the normal workings of the heart?arrow_forward
- Leaky Na+ channels in the cells of the SA Node do which of the following? a-allow a slow repolarization which causes the delay in the AV Node b-allow a slow depolarization which causes the atria to contract for a longer time and fill the ventricles more completely c-allow a slow repolarization which brings the membrane potential back to a resting state d-allow a slow depolarization that eventually reaches the threshold for voltage-gated Ca2+ channelsarrow_forwardSketch the heart and draw all the coronary vessels in their correct locations. (Alternatively, you could locate these vessels on a realistic diagram of the heart.)arrow_forwardThe inferior vena cava brings blood from the lower regions of the body and empties into the __________. A left atrium B aorta C left ventricle D right atrium E right ventriclearrow_forward
- The delivery of blood by the left ventricle into the sorta is intermittent, whereas blood flow in the peripheral circulation is usually continuous. Which of the following best explains this difference? A. Arteries contain more elastic tissue than veins . B Capillary walls contain little elastic or muscular tissue . C. Continuous flow is needed to meet metabolic requirements. D. Passive recoil of the arteries delivers blood to the periphery during diastole E . Rhythmic contractions of arterial smooth muscie increase the diastolic pressure to above zeroarrow_forwardComplete ventricular filling occurs during what phase of the cardiac cycle? a. when the atria are in diastole b. when the ventricles are in diastole c. when the ventricles are in systolearrow_forwardHow do the walls of the atria compare with the walls of the ventricles and why are they different? Which heart chamber has the thickest muscle wall? Why is it necessary for the chamber in the above question to have a thicker muscle wall? What is the purpose of heart valves? Name & compare the heart valves found between the upper & lower chambers of the right and left sides of the heart ?arrow_forward
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