Kristin Mangrum_Chapter20

Kristin Mangrum_Chapter20 - Kristin Mangrum Chapter 20...

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Kristin Mangrum Chapter 20 Questions 1. The four functions of the heart are to generate blood pressure, routing blood, ensuring on way blood flow, and regulating the blood supply. Contractions of the heart are what generate blood pressure, which is responsible for moving blood through the blood vessels. The heart separates the pulmonary and systemic circulation and ensures better oxygenation of the blood flowing to the tissues. The valves of the heart ensure a one-way blood flow through the heart and the blood vessels. The rate of force and heart contractions changes to meet the metabolic needs of the tissue, which vary depending on such conditions at rest, exercise, and changes in body positions. 2. The approximate size of the heart is the size of a closed fist. The shape of the heart consists of an apex and a base. The apex is at the bottom of the heart and points left, and is the blunt, rounded point of the heart. The base is the larger, flat part at the opposite end of the heart. 3. The heart is located in the mediastinum, a midline portion of the thoracic cavity that also contains the trachea, the esophagus, the thymus, and associated structures. It is important for health professionals to know the location of the heart in the thoracic cavity. Positioning a stethoscope to hear the heart sounds and positioning electronodes to record an electrocardiogram from chest leads to depend on this knowledge. Effective CPR also depends on a reasonable knowledge of the position and shape of the heart. 4. The pericardium is a double layered, closed sac that surrounds the heart. It consists of a tough, fibrous outer layer called the fibrous pericardium, and a thin, transparent, inner layer of simple squamous epithelium called serous pericardium. The fibrous pericardium prevents over distention of the heart and anchors it within the mediastinum. Superiorly,
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This note was uploaded on 05/02/2011 for the course BIOL 102 taught by Professor Henry during the Spring '08 term at Baton Rouge CC.

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Kristin Mangrum_Chapter20 - Kristin Mangrum Chapter 20...

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