Chapter 18- The Cardiovascular System-Heart Assignment.rtf - Chapter 18 The Cardiovascular System The Heart For this assignment please read the chapter

Chapter 18- The Cardiovascular System-Heart Assignment.rtf...

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Chapter 18 – The Cardiovascular System: The Heart For this assignment, please read the chapter and answer the questions below. Please type your answers in red or blue color. Please note that points may be deducted if answers are not submitted in these colors. Cardiovascular System: The cardiovascular system consists of the heart, and vessels, arteries, capillaries and veins. What is the function of this system? to transport nutrients, oxygen, and hormones to cells throughout the body and to get rid of metabolic wastes Heart: The heart is a hollow, __ cone __________-shaped, muscular pump within the _ thoracic ___ cavity. The average adult heart is _ 14 ______ cm long and __ 9 _______ cm wide. The heart lies in the __ mediastinum _______ under the sternum; its apex extends to the _ fifth ___ intercostal space. Pericardium: It is made of a tough outer bag that surrounds a double-layered sac. This tough, outer layer is composed of dense connective tissue and is called the __ fibrous ___ pericardium. Double-layered sac. The innermost layer of this sac immediately surrounds the heart and is called the ___ visceral ______ pericardium (also called __ epicardium _______). At the base of the heart, this inner layer folds back on itself to become the __ parietal _______ pericardium. Between the layers of this sac is a potential space called the __ pericardial _______ cavity and it is filled with ___ serous ______ fluid. What is the function of this fluid? it acts as a lubricant and reduces friction from movement of muscles Wall of the Heart The wall of the heart is composed of three distinct layers. The outermost layer, the _ epicardium ___, is made up of connective tissue and epithelium, and contains blood and lymph capillaries along with __ coronary ___ arteries. It is the same as the visceral pericardium. The middle layer called __ myocardium ___consists of cardiac muscle and is the thickest layer of the heart wall.

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