Take the 2-minute tour ×
Biology Stack Exchange is a question and answer site for biology researchers, academics, and students. It's 100% free, no registration required.

I first covered the fast and moderate control mechanisms which I think are

Fast control: Baroreceptive reflex (tonus), Chemoreceptive reflex (CO$_2$). Moderate control: Bicarbonate (ECF), Phosphate buffer (ECF), Proteins (ICF).

then late control mechanisms about which I am unsure

  • Capillary fluid shift mechanisms
  • Stress-relaxation of the vasculature
  • RAA

What are the late control mechanisms of blood pressure?

share|improve this question

closed as unclear what you're asking by Majid, HDE 226868, dustin, Chris, Chris Stronks Jan 24 at 19:06

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

1 Answer 1

Capillary fluid shift mechanisms

If the pressure of the blood is high, there is high hydrostatic pressure. Simply put, this means fluid exits the capillaries at the arterial side due to this pressure, and less fluid returns at the venous side. With less fluid in the circulation, blood pressure falls.

Stress-relaxation of the vasculature

Imagine the arteries are like springs. The more you pull them the stronger the recoil force. However if you stretch them too much for too long, they stay stretched.

Renin-Angiotensin-Aldosterone system

When the blood pressure is high, there is less release of renin from the kidneys. This means less angiotensin II production. Angiotensin acts to increase blood pressure by increasing vasoconstriction and increasing retention of fluid and salt (via aldosterone). With less RAA system activation, the blood pressure drops.

share|improve this answer
    
Can you say about the stress-relaxation of vasculature that high ICF leads to increased diameter and length of arteries? –  Masi Feb 17 '14 at 5:59

Not the answer you're looking for? Browse other questions tagged or ask your own question.