The answer is Detection of ions by the hypothalamus.
If a person has been drinking a lot of water and has not lost a lot of water through sweating, the hypothalamus can detect too much water in the blood plasma. In this case, less ADH is released from the pituitary gland. The renal tubules become less permeable to water.
What is ADH production?
- The hypothalamus in the brain has osmoreceptors that perceive the water level in the blood plasma as a stimulus.
- When the water level is too low, the hypothalamus sends a signal to the pituitary gland to release the antidiuretic hormone ADH.
- ADH travels in the bloodstream to its target organ, the kidneys.
- Causes the renal tubules to become more permeable. This means that with selective reabsorption, more water can leave the renal tubule to be reabsorbed back into the blood.
- Depending on the water concentration in the blood plasma, different amounts of ADH are released into the bloodstream. The diagrams show what happens when there is too little or too much water in the blood.
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