chapter 21- Blood - Chapter 21 The heart helps keep the blood The heart beats about The heart pumps about gallons of blood per year The heart pumps

chapter 21- Blood - Chapter 21 The heart helps keep the...

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The heart helps keep the blood In motion The heart beats about 100,000 per day The heart pumps about ___ gallons of blood per year 1.5 millions The heart pumps between ___ and ___ liters of blood per minute 5 and 30 literes The heart is about the size of a Clenched fist The heart consists of Four chambers: two atria, two ventricles The heart pumps blood into two circuits: Pulmonary circuit, and systemic circuit Pericardium is the Serous membrane lining the pericardial cavity The pericardial membrane forms two layers Visceral pericardium (epicardium) and parietal pericardium Parietal pericardium is reinforced by a layer called Fibrous pericardium The parietal pericardium and fibrous pericardium constitute Pericardial sac The walls of the heart has 3 layers Epicardium, myocardium, endocardium Epicardium is the External surface Myocardium consists of Cardiac muscle cells Endocardium is Internal surface Cardiac muscle cells are mostly dependent on Aerobic respiration The circulatory supply of cardiocytes is Very extensive Cardiocytes contract with information from CNS Cardiocytes are ___ by____ Interconnected by intercalated discs Cardiac cells have Specialized cell to cell junctions The ___ of two cardiac cells are bound together by ___ Sacrolemmae; desmosomes The ____ bind ___ of adjacent cells together Intercalated discs; myofibrils Cardiac cells are bound together by Gap junctions Ions move directly from one cell to another allowing All the sacromeres to contract as one unit Each cardiac cell is wrapped in a Elastic sheath Each muscle layer is wrapped in a Fibrous sheet The fibrous sheets also encircle the Base of the pulmonary trunk and ascending aorta Functions of the fibrous skeleton 1)stabilizes the position of cardiac cells 2)stabilizes the position of the heart valves 3)provides support for the blood vessels and nerves in the myocardium 4)helps to distribute the forces of contraction 5)helps to prevent overexpansion of the heart 6)provides elasticity so the heart recoils after contraction 7)isolates atrial cells from ventricular cells The heart lies
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  • Spring '08
  • wetherbee
  • Biology, right ventricle, left ventricle, right atrium

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