Regulation of pH of the blood
Explain how the regelation of the pH in the blood.
When the blood pH become to low, the excess h+ ions in the blood are removed so the pH can increase and return back to normal
When the Blood pH rises to high (too alkaline), fewer H+ ions are secreted from the blood to the tubules and more bicarbonate ions are secreted from the blood into the tubles, making the amount of H+ ions higher in the blood to increase the pH in the blood back to normal
Regulation of salt concentration of the blood
Explain the regulation of the salt concentration in the blood.
- when the sodium concetration (salt) becomes too low, the adrenal cortex is stimulated to secrete more aldosterone.
- More sodium ions are reabsorbed from the kidney into the blood.
- The concentration of sodium ions in the blood increases and fewer sodium ions are excreted in the urine.
- When the sodium concentration in the blood becomes too high, less aldosterone is secreted by the adrenal cortex.
- Fewer sodium ions are reabsorbed from the kidney.
- The concentration of sodium ions in the blood decreases and more sodium ions are excreted as part of the urine.
Regulation of water content in the blood
What is the hormone secreted that regulates the water content in the blood?
ADH
Regulation of water content in the blood
What secretes the hormone that regultates the water content in the blood?
the Hypophysis
Regulation of water content in the blood
What detects the decrease or increase of water content in the blood?
The osmorecepters in the Hypothalmus
Regulation of water content in the blood
Explain the Regulation of water content in the blood when it decreases.
- When the water content in the blood decreases, the osmoreceptors in the hypothalamus in the brain are stimulatd and more ADH is secreted by the hypophysis into the bloodstream
- ADH makes the walls of the distal convaluted tuble and collecting ducts more permeable to water
- Therefor more water is reabsorbed into the blood
- Urine becomes more concentrated and its volume decreases
- The osmoreceptors also stimulate the thirst centre in the brain and more fluid is taken in
- Water content increases back to normal
Regulation of water content in the blood
Explain the Regulation of water content in the blood when it increases.
- when the water content in the blood increases, the osmoreceptors in the hypothalamus are not stimulated
- Less ADH is secreted by the hypophysis
- The distal convaluted tubules and collecting ducts become less permeable to water
- less water is reabsorbed
- urine is less concentrated and its volume increases
- large amounts of water are excreted in the urine
- water content decreases back to normal.
