Each side of the heart consists of an atrium and a ventricle which are two connected chambers. The atria (plural of atrium) are where the blood collects when it enters the heart. The ventricles ...

Later, at end of dissection, cut heart open as described on page 55 (Figure 5.2) and note the interior structure of the heart chambers, semilunar valves, atrioventricular aperture. Next, cut the ...