100%(4)4 out of 4 people found this document helpful
This preview shows page 1 - 2 out of 5 pages.
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?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 _5th_______ 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 helps friction of the muscle movement, or a lubricant.Wall of the HeartThe wall of the heart is composed of three distinct layers.The outermost layer, the __