How is your blood pressure constantly changing when you presumably have a relatively fixed amount of blood in a fixed amount of vein?

Question

I get that your heart can pump harder and whatnot, but when it’s a fairly closed system pumping the same blood around how does that actually increase the pressure?

In: 12

Answer 1

Your vessels expand and contract as well. The same amount of flow in a smaller area produces a higher pressure.

Answer 2

Your vessels expand and contract as well. The same amount of flow in a smaller area produces a higher pressure.