The wall that separates the upper chambers of the heart is the ______, and the wall that separates the lower chambers is the ______.Multiple choice question.chordae tendinae; papillary musclesinterventricular septum; interatrial septuminteratrial septum; interventricular septumendocardium; pericardium

What is the interatrial septum?Multiple choice question.the wall that separates the right and left atriathe wall that separates the heart from the pericardial cavitythe wall that separates the atria from the ventriclesthe wall that separates the right and left ventricles

The heart, and the proximal ends of the large blood vessels to which it attaches, are enclosed in a membranous sac called the ______.Multiple choice question.myocardiumpericardiummediastinum

Select all that applyWhich of the following are features of ventricles?Multiple select question.Upper chambers of the heartThin-walledLower chambers of the heartThick-walled

What is the middle layer of the wall of the heart?Multiple choice question.pericardiummyocardiumendocardium

Which structure separates the right and left superior chambers of the heart? The mitral valve The interventricular septum The interatrial septum The pulmonic valve