Health Tooty Fruity

As mentioned, antidiuretic hormone signals the kidneys to retain more water when blood pressure drops. Kidney cells respond to lower blood pressure by releasing the enzyme renin, as seen in Figure 7-5. Renin causes the kidneys to retain more sodium. The extra sodium draws more water back from the urine to increase blood volume. Extra dietary sodium can also raise blood pressure by causing more water



Figure 7-5 Sodium and renin help to control blood pressure.


retention. Renin also triggers vasoconstriction, the narrowing of blood vessels. This also raises blood pressure. Renin activates a blood protein, angiotensin, which causes the vasoconstriction.

Macro Minerals

Water and Electrolytes

Water Output-Water Input

Electrolytes

Blood Pressure and Blood Volume

Fluid and Electrolyte Balance in the Cells

Movement of Electrolytes

Fluid and Electrolyte Balance in the Body

Acid-Alkaline Balance