Systolic is a word that has to do with the heart. It is the highest pressure in the arteries when the heart beats.
Systolic is a medical word that doctors use to talk about how the heart is working.
Examples:
The doctor checked my systolic pressure.
My systolic number is high.
The systolic pressure is the top number in a blood pressure reading.
The systolic pressure is like the boss of the heart's job.
When I get scared, my systolic pressure goes up.
The systolic number is the big number in a blood pressure test.