What does blood pH have to do with pressure?

Blood pH directly affects blood pressure. When the pH of blood decreases (becomes more acidic), it causes blood vessels to constrict, which increases blood pressure. Conversely, when the pH of blood increases (becomes more alkaline), it causes blood vessels to dilate, which decreases blood pressure.

The relationship between blood pH and blood pressure is regulated by the body's renin-angiotensin-aldosterone system (RAAS). The RAAS is a hormone system that helps control blood pressure and electrolyte balance. When the pH of blood decreases, the RAAS is activated, which causes the release of renin, angiotensin, and aldosterone. These hormones then cause blood vessels to constrict and water and salt retention, which increases blood pressure.

In contrast, when the pH of blood increases, the RAAS is inhibited, which causes the release of less renin, angiotensin, and aldosterone. This leads to dilation of blood vessels and excretion of water and salt, which decreases blood pressure.

Therefore, blood pH is an important factor in the regulation of blood pressure. Maintaining a normal blood pH is crucial for overall cardiovascular health.