Question

When the body becomes dehydrated, a chemical signal is sent that causes nephrons in the kidneys to absorb more water and excrete more salts. this is an example of a _____?

Answer 1

I believe the answer you are seeking is feedback loop

Answer 2

Answer:

Negative feedback

Explanation:

Dehydration stimulates the posterior pituitary gland to release vasopressin hormone in blood which in turn makes kidneys to reabsorb more water. vasopressin prevents water loss by stimulating the formation of concentrated urine and release of more salts from the body. Since the hormone is released to bring about change in the hydration level of the body (to restore the controlled condition again by reversing the change), it is an example of a negative feedback system.