Did your pulse change when standing? why do you think a change did or did not occur?

Explanation:

The pulse of the bodies raises for the first 20 seconds after sitting for a prolonged period of time and then to a standing position. It should, however, return to normal afterwards. The heartbeat of the body decreases because as you travel the blood needs to flow to the active areas and the blood flows downward from gravity, however you still need to pump blood to your brain. The rise in blood demand makes the heart pump more rapidly.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: