I just wanted to start this deep thread regarding reference of hirda many times in Gurbani.
My take on Hirda in gurbani have multiple meaning depending on the context its not referred to as physical heart. Yes only few times according to my understanding- refered to anhat-reference point/pointer from shabad surat perspective only few times but for most part its refered to jot saroop where our jot/atma resides and its not location either..i found very deep and interesting article on hirda /hea
This is quite a deep topic and one which we can all begin to understand and contemplate better with experience, development and progress.
Firstly, I think it's important to point out that this is not the physical heart but more so what is termed the ''Spiritual Heart'' in many other faiths as well.
My main interpretation is referring to this spitiual and sukham hirda that can be felt but is not physical.
Although, Sat1176 ji above, correctly pointed out the heartbeat and pulse japping naam so