GENERAL ANATOMY
ANATOMY OF THE HEART
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The heart is located within the mediastinum
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The apex is located to the left of the Sternal midline at the level of the fifth intercostal space
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The Base of the heat is located at the level of the second rib
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The pericardium is composed of cardiac muscle
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Detailed explanation-1: -Thus, the correct answer is ‘They do not show striations’.
Detailed explanation-2: -The pericardium consists of two layers: the fibrous and the serous. The fibrous pericardium is a conical-shaped sac. Its apex is fused with the roots of the great vessels at the base of the heart.
Detailed explanation-3: -The individual cardiac muscle cell (cardiomyocyte) is a tubular structure composed of chains of myofibrils, which are rod-like units within the cell. The myofibrils consist of repeating sections of sarcomeres, which are the fundamental contractile units of the muscle cells.
Detailed explanation-4: -Cardiac muscle cells (cardiomyocytes) are striated, branched, contain many mitochondria, and are under involuntary control. Each myocyte contains a single, centrally located nucleus and is surrounded by a cell membrane known as the sarcolemma.