Anatomy & Physiology
5th Edition
ISBN: 9780321861580
Author: Marieb, Elaine N.
Publisher: Pearson College Div
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Textbook Question
Chapter 17, Problem 1CYU
The heart is in the mediastinum. Just what is the mediastinum?
Expert Solution & Answer
Summary Introduction
To review:
Explain mediastinum.
Introduction:
The heart is a muscular pumping organ, which consists of four chambers. It is present in the mediastinum. The two upper chambers are small and are called the atria, whereas the two lower large chambers are called the ventricles. The right side of the heart receives carbon dioxide-rich blood and then pumps blood to lungs for oxygenation. The left side of the heart receives oxygen-rich blood from lungs as well as pumps this blood to the tissues.
Explanation of Solution
The heart is a cone-shaped organ, which is enclosed within the mediastinum. The mediastinum is the medial cavity of the thorax and is located between the pleura of the two lungs. It is surrounded by loose connective tissues and contains several structures, such as the heart, blood vessels, esophagus, trachea, thoracic duct, as well as lymph nodes.
The mediastinum can be divided into superior, anterior, middle and posterior mediastinum. The middle mediastinum occupies the heart. The heart rests on the superior surface of the diaphragm, lies posterior to the sternumas well as anterior to the vertebral column. Two thirds of its mass lie to the left of the midsternal line whereas the balance projects to the right.
Conclusion
Thus, it canconclude that the mediastinum is situated in the central compartment of the thoracic activity and encloses the heart.
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Chapter 17 Solutions
Anatomy & Physiology
Ch. 17 - The heart is in the mediastinum. Just what is the...Ch. 17 - From inside to outside, list the layers of the...Ch. 17 - What is the purpose of the serous fluid inside the...Ch. 17 - What is the function of the papillary muscles and...Ch. 17 - Which side of the heart acts as the pulmonary...Ch. 17 - Which of the following statements are true? (a)...Ch. 17 - Prob. 7CYUCh. 17 - For each of the following, state whether it...Ch. 17 - Cardiac muscle cannot go into tetany. Why?Ch. 17 - Which part of the intrinsic conduction system...
Ch. 17 - Describe the electrical event in the heart that...Ch. 17 - The second heart sound is associated with the...Ch. 17 - If the mitral valve were insufficient, would you...Ch. 17 - During the cardiac cycle, there are two periods...Ch. 17 - Prob. 15CYUCh. 17 - What problem of cardiac output might ensue if the...Ch. 17 - When the semilunar valves are open, which of the...Ch. 17 - The portion of the intrinsic conduction system...Ch. 17 - An ECG provides information about (a) cardiac...Ch. 17 - The sequence of contraction of the heart chambers...Ch. 17 - The fact that the left ventricular wall is thicker...Ch. 17 - Prob. 6RQCh. 17 - In the heart, which of the following apply? (1)...Ch. 17 - The activity of the heart depends on intrinsic...Ch. 17 - Freshly oxygenated blood is first received by the...Ch. 17 - Describe the location and position of the heart in...Ch. 17 - Describe the pericardium and distinguish between...Ch. 17 - Trace one drop of blood from the time it enters...Ch. 17 - (a) Describe how heart contraction and relaxation...Ch. 17 - The refractory period of cardiac muscle is much...Ch. 17 - (a) Name the elements of the intrinsic conduction...Ch. 17 - Draw a normal ECG pattern. Label and explain the...Ch. 17 - Define cardiac cycle, and follow the events of one...Ch. 17 - What is cardiac output, and how is it calculated?Ch. 17 - Discuss how the Frank-Starling law of the heart...Ch. 17 - Prob. 1CCSCh. 17 - Prob. 2CCSCh. 17 - Prob. 3CCSCh. 17 - Prob. 4CCSCh. 17 - Prob. 5CCSCh. 17 - Prob. 6CCS
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