Choose the odd one out from the following terms and name the category to which the others belong:
Cervix, Chordae Tendinae, Papillary Muscles, Sinoatrial node
Topic: Structures of the heart
Answer
Odd one out: CERVIX. Category of the others: STRUCTURES OF THE HUMAN HEART.
Chordae tendinae, papillary muscles and the sinoatrial node are all parts of the HEART: PAPILLARY MUSCLES are cone-shaped muscles projecting from the ventricle wall. CHORDAE TENDINAE are the tendinous cords joining those muscles to the flaps of the atrioventricular valves, holding them shut against the pressure of ventricular systole. The SINOATRIAL NODE is the pacemaker, in the wall of the right atrium, which initiates each heartbeat.
The CERVIX is the narrow neck of the UTERUS, part of the female reproductive system. It has nothing to do with the heart.
THE MISTAKE TO AVOID is subdividing the three cardiac structures — for example arguing that the SA node is electrical while the other two are mechanical. That is a true distinction, but it is not what the question wants. Find the category that covers THREE of the four terms, and here it plainly covers the three heart structures.