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 veins are able to contract, this is called hypertension. When enough of the veins contract it leaves less volume for the blood, but like you said the blood isn’t going anywhere, so it pushes against the arterial walls in a measurable way.

Answer 2

Your veins are able to contract, this is called hypertension. When enough of the veins contract it leaves less volume for the blood, but like you said the blood isn’t going anywhere, so it pushes against the arterial walls in a measurable way.