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Study with Quizlet and memorize flashcards containing terms like Trace the pathway of blood through the heart, Compare the pulmonary and systemic circuits, Explain the operation of the heart vavles and more.
Study with Quizlet and memorize flashcards containing terms like size and location of the heart, pericardium, pericardial cavity and more.
Study with Quizlet and memorize flashcards containing terms like Base of the Heart, Apex of the Heart, Coronary Sulcus and more.
- Location of The Heart
- Shape and Size of The Heart
- Chambers and Circulation Through The Heart
- Membranes
- Layers
- Internal Structure of The Heart
- Disordersof The Heart Valves
- Coronary Circulation
The human heart is located within the thoracic cavity, between the lungs in the space known as the mediastinum. Figure 1 shows the position of the heart within the thoracic cavity. Within the mediastinum, the heart is enclosed by a tough membrane known as the pericardium, or pericardial sac, and sits in its own space called the pericardial cavity. ...
The shape of the heart is similar to a pinecone, rather broad at the superior surface and tapering to the apex. A typical heart is approximately the size of your fist: 12 cm (5 in) in length, 8 cm (3.5 in) wide, and 6 cm (2.5 in) in thickness. The heart of a well-trained athlete, especially one specializing in aerobic sports, can be considerably la...
The human heart consists of four chambers: The left side and the right side each have one atrium and one ventricle. Each of the upper chambers, the right atrium (plural = atria) and the left atrium, acts as a receiving chamber and contracts to push blood into the lower chambers, the right ventricle and the left ventricle. The ventricles serve as th...
The membrane that directly surrounds the heart and defines the pericardial cavity is called the pericardium or pericardial sac. The pericardium, which literally translates as “around the heart,” consists of two distinct sublayers: the sturdy outer fibrous pericardium and the inner serous pericardium. The fibrous pericardium is made of tough, dense ...
The wall of the heart is composed of three layers of unequal thickness. From superficial to deep, these are the epicardium, the myocardium, and the endocardium. The outermost layer of the wall of the heart is also the innermost layer of the pericardium, the epicardium, or the visceral pericardium discussed earlier. The middle and thickest layer is ...
Recall that the heart’s contraction cycle follows a dual pattern of circulation—the pulmonary and systemic circuits—because of the pairs of chambers that pump blood into the circulation. In order to develop a more precise understanding of cardiac function, it is first necessary to explore the internal anatomical structures in more detail.
When heart valves do not function properly, they are often described as incompetent and result in valvular heart disease, which can range from benign to lethal. Some of these conditions are congenital, that is, the individual was born with the defect, whereas others may be attributed to disease processes or trauma. Some malfunctions are treated wit...
You will recall that the heart is a remarkable pump composed largely of cardiac muscle cells that are incredibly active throughout life. Like all other cells, a cardiac muscle cell requires a reliable supply of oxygen and nutrients, and a way to remove wastes, so it needs a dedicated, complex, and extensive coronary circulation. And because of the ...
The shape of the heart is similar to a pinecone, rather broad at the superior surface and tapering to the apex (see Figure 19.2). A typical heart is approximately the size of your fist: 12 cm (5 in) in length, 8 cm (3.5 in) wide, and 6 cm (2.5 in) in thickness.
Blood travels through the bicuspid valve to the left atrium. Both the aortic and the pulmonary valves are semilunar valves. The mitral valve is an atrioventricular valve. The heart is composed of three layers; the epicardium, the myocardium, and the endocardium, illustrated in Figure 21.11.
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What is the heart, where is located, and what is its function? Outline the structure of the heart. Describe the coronary circulation. Summarize how blood flows into, through, and out of the heart. Define the cardiac cycle, and identify its two parts. Explain what controls the beating of the heart. a.
