| Answer | Crossword Clue |
|---|---|
| sinoatrial | as in sinoatrial node, a small mass of tissue embedded in the right atrium of the heart, that regulates the heartbeat |
| Answer | Crossword Clue |
|---|---|
| sinoatrial | as in sinoatrial node, a small mass of tissue embedded in the right atrium of the heart, that regulates the heartbeat |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.