Hello, and hopefully I'm understanding your question correctly in that you are trying to figure out why when your blood pressure is higher your pulse is lower, and vice versa. I'll answer this, and if I'm off base, let me know.
This is the natural way for your body to compensate because as the pressure in your blood vessels goes down (ie dropping blood pressure), your heart has to pump more times to get sufficient blood out. Just like if you started running, you are going to start breathing faster to get more oxygen. In turn, if your blood pressure goes up, your heart doesn't have to beat as often in order to get the blood out, because it's moving under a higher pressure.
I hope this answers your question, and makes sense, I understand it can be a bit confusing. If not, please let me know, best wishes...
Please ask if you need clarification/more information.
POSITIVE feedback & a BONUS are greatly appreciated.
Please note that answers are for information only, do not take the place of an assessment by your doctor, and does not establish a patient-physician relationship