Question

current attempt in progress
which of the following statements is incorrect?
the coronary sinus empties into the left atrium.
portions of the interior wall of the right atrium have pectinate muscles while just the auricle of the left atrium has pectinate muscles.
the left atrium receives blood from 4 pulmonary veins.
the left and right ventricles contain chordae tendineae and trabeculae carneae.

Explanation:

The coronary sinus empties into the right atrium, not the left atrium. The right atrium has pectinate muscles on parts of its interior wall and only the auricle of the left atrium has them. The left atrium receives blood from 4 pulmonary veins. Both left and right ventricles have chordae tendineae and trabeculae carneae.

Answer:

The coronary sinus empties into the left atrium.