This AV node electrically connects the upper and lower chambers of the heart. (sciencenewsforstudents.org)
These larvae travel to the heart and grow into large adult worms in the right chambers of the heart. (oakhillsanimal.com)
This act is not an instant accomplishment, taking place in the secret chambers of the heart, but, as the inquiry suggests, a lifelong public commitment. (religion-online.org)