-Reduces friction-Keeps the heart consisted of in the chest cavity.-Prevents the love from overexpanding when blood -volume increases.-Limits love motion
1. Visceral pericardium aka epicardium (closest to the heart)2. Parietal pericardium ( lines the inner surface ar of the pericardial sac.

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Serous liquid acts as a lubricant; and reduces friction between the the opposite layers together the love beats.
also well-known as left and also right atrial appendages. Useful the auricles offer as reservoirs for extra volume in ~ the atrium chambers.
The atria obtain blood return to the heart from other areas of the body.R atrium: receives deoxygenated blood return to the heart from the superior and also inferior venae cavae. Together atrium: obtain oxygenated blood return to the heart from the pulmonary veins.
The remarkable vena cava return de-oxygenated blood native the head, neck, arm and also chest regions of the body to the right atrium. The worse vena cava returns de-oxygenated blood indigenous the lower body areas (legs, back, abdomen and pelvis) to the right atrium.
located in the right atrium; runs transversely in the groove between the left atrium and left ventricle, medial to the worse vena cava opening.Function: deoxygenated blood native the heart muscle itself drains into the best atrium via the coronary sinus.
Located in between the atria and also the ventricles. Function is to stop backflow of blood right into the atria.
1- bring ventricular walls closer together during contraction preventing backflow 2- pull the semilunar valves open to permit ventricular ejection.3- pull the AV Valves open during atriole systole.4- stop balloning that AV valves laflets ago into the atria throughout ventricular systole,and to stop AV valvular regurgtion.
A semilunar valve is discovered at the basic of the pulmonary trunk. This semilunar valve prevents blood from flowing back into the ventricles.
Interatrial septum separates the left and also right atria.Interventricular septum separates the left and right ventricles.
Name, in the exactly order, all the frameworks that blood flows through on its trip from the superior and inferior venae cavae to the aorta.
deoxygenated blood in ~ the superior and also inferior vena cava enters in the R atrium also venous blood from the love muscle itself enters the R atrium with the coronary sinus; goes v the tricuspid (R AtrioVentricular) valve; beginning the R ventricle; pulmonary semilunar valve; together & R pulmonary arteries to the L&R lungs; oxygenated blood travels v pulmonary veins; beginning the together atrium; bicuspid (L AV) valve; together ventricle; aortic semilunar valve; aorta.
carries deoxygenated blood away from the heart, to the lungs, and also returns oxygenated blood ago to the heart.
The left and the appropriate coronary arteries arise from the base of the aorta and encircle the heart. Branches of these arteries supply the heart v oxygen and also nutrients whilst the cardiac veins drainpipe the venous blood right into the coronary sinus i beg your pardon empties into the right atrium.
Why are the wall surfaces of the aorta and the pulmonary trunk/arteries for this reason thick contrasted to the venae cavae?
Arteries have thicker epithelium/muscular/elastic walls compared to veins, since they need to cope with a much higher pressure. The heart needs to pump blood in ~ high pressures to ensure that the blood reaches every the cell of the body, native the brain to the toes. Thicker walls permit the arteries come cope through the pressure, instead of rupturing.
The fossa ovals is located between the two atria in the interatrial septum and is one embryonic remnant the the foramen ovale.
The left ventricle is much more muscular 보다 the right ventricle since it pumps the blood in ~ a greater pressure.The left ventricle pumps blood in ~ a greater pressure since it has actually a more distance come travel, blood native the left ventricle goes to all locations of the body. The best ventricle only has to pump blood to the lung which is a much much shorter distance, as such less pressure is required.
Why perform the coronary arteries arise indigenous the basic of the aorta and not native the base of the pulmonary trunk?
purpose that the coronary artery is to supply oxygenated blood come the heart if the arteries raised from the basic of the pulmonary trunk castle would only have accessibility to deoxygenated blood.

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