The Layers Of The Heart Wall

1305 Words6 Pages
. The layers of the heart wall include epicardium, myocardium, and endocardium. Epicardium is the surface of the wall and it’s also called visceral pericardium. It contains serous membrane covering the heart. Myocardium is in the middle of the two layers it’s described as having a thick muscular layer of the heart. It serves as having contractions of the heart as well in containing fibrous skeleton in networking of collagenous and elastic fibers. Some of the functions are providing structural support, attachment for cardiac muscle, and having electrical insulation. Endocardium is the inner lining that is smooth and contains epithelial. There is also the pericardial sac which allows the heart to beat without friction and the heart having room to expand and resist excessive expansion. It has three layers which include parietal pericardium the tough outer layer, pericardial cavity is filled with pericardial fluid, and visceral pericardium which is thin, smooth, and serous layer covering the heart surface. 2. Three reasons why dynamic or parallel blood flow through the systemic circuit is important is because it supplies blood to all organs of the body, it’s catered to the body’s needs, and it diffuses CO2 from blood. 3. The heart is located in the center of the thorax between the lungs and has a pericardial sac. It allows the heart to beat without friction giving room to expand and resist the excess to expand. The heart has three layers the epicardium has serous membrane covering the heart. Myocardium is the middle layer that is has a thick muscular layer of the heart with fibrous skeleton. Endocardium is the epithelial layer that is smooth of the inner lining. There are four chambers in the heart the right and left atria are the r... ... middle of paper ... ...some that have large fenestrations allowing proteins and blood cells to enter or cut the blood through. 10. The hormones that regulate blood pressure are aldosterone, atrial natriuretic factor/peptide/hormone (ANP), antidiuretic hormone, epinephrine and norepinephrine. These hormones start with Aldosterone retaining water in the kidneys by promoting sodium and atrial natriuretic factor/peptide/hormone is the releasing of sodium by urination and generalized vasodilation. Then the antidiuretic hormone is water retention maintaining high blood pressure, it contains high concentrations, and vasoconstriction. Finally, epinephrine and norepinephrine controls blood pressure in a stress situation it has the most blood vessels binding to a-adrenergic receptors and vasoconstriction. The skeletal and cardiac muscle blood vessels bind to B-adrenergic receptors and vasodilation.

More about The Layers Of The Heart Wall

Open Document