The sinoatrial (SA) node causes the heart to contract and is..
Added 2023-04-08 04:03:42 +0000 UTCThe sinoatrial (SA) node causes the heart to contract and is considered the pacemaker of the heart. My vixen has the same effect on me. She makes my heart to flutter when she walks in a room and can slow it down with her hand on my cheek.
