RIGHT VENTRICLE • general features: wall thickness is less than that of the left ventricle; receives blood from the right atrium via the right atrioventricular orifice; • trabeculae carneae: criss-crossing muscular ridges on the internal walls of the ventricle; composed of myocardium; • right atrioventricular valve: also known as the _______________________ valve; consists of three triangular-shaped flaps called cusps; consists of dense connective tissue covered by endothelium; • papillary muscles of the right ventricle: internal cone-shaped projections of the myocardium; each attaches to a separate cusp of the tricuspid valve via the chordae tendineae; • chordae tendineae of the right ventricle: fibrous cords that attach the cusps of the tricuspid valve to the papillary muscles; function to maintain closed state of right atrioventricular valve; • interventricular septum: thick muscular partition that separates the ___________________________ from the __________________________; • pulmonary trunk: carries all blood from the right ventricle into the pulmonary circuit where the blood receives oxygen from the lungs (become oxygenated); • pulmonary semilunar valve: found in the origin of the pulmonary trunk; consists of three cusps; made up of dense connective tissue covered by endothelium; functions to prevent backflow of blood.

LEFT ATRIUM • general features: lies to the left of and slightly posterior to the right atrium; receives blood from the pulmonary blood circuit via the pulmonary veins; • right and left pulmonary veins: total of _________________ vessels; drain into the left atrium; return oxygenated blood to the heart from the _______________; • auricle of the left atrium: similar in structure to the auricle of the right atrium; only part of left atrium to contain pectinate muscles; LEFT VENTRICLE • general features: walls are thickest in this chamber; receives blood from the left atrium; drained by the aorta; trabeculae carneae are muscle bundles that line the ventricular walls; • left atrioventricular valve: also known as the ___________________ or __________________ valve; consists of 2 cusps; made up of dense connective tissue covered by endothelium; • papillary muscles of the left ventricle: are ____________ in number; internal projections of the myocardium; each attaches to a separate cusp of the bicuspid valve via the chordae tendineae; • aorta: drains the left ventricle; carries blood to most parts of the body within the systemic blood circuit; • aortic semilunar valve: similar in structure to the pulmonary semilunar valve, consisting of 3 cusps; made up of dense connective tissue covered by endothelium.

Which of these valves is found between the right atrium and the right ventricle?Multiple ChoiceInterventricular septumTricuspid valveAortic semilunar valvePulmonary semilunar valveBicuspid (mitral) valve

Which heart valve has leaflets described as "anterior, left and right"? Aortic Pulmonary Left atrioventricular Right atrioventricular

The right atrioventricular valve (tricuspid) regulates the opening between the______and the _____. Right atrium; left atrium Right atrium; right ventricle Right atrium; left ventricle Left atrium; left ventricle Left ventricle; right ventricle

The apex of the heart is comprised mainly of the right ventricle