Question

When we become dehydrated, there is insufficient water in our blood Osmoreceptors in the brain detect the decrease in water levels in the blood, and the hypothalamus secretes antidiuretic hormone (ADH). ADH signals the kidneys to recover water from the urine. As a result the amount of water in the blood increases. This is an example of which of the following (select all that apply)?
Group of answer choices

a homeostatic mechanism

a negative feedback mechanism

a positive feedback mechanism

organization of living things

Answer 1

The scenario you described can be classified as the following:

1. **a homeostatic mechanism** - Yes, this process is aimed at maintaining homeostasis by regulating the body's water balance.

2. **a negative feedback mechanism** - Yes, this is an example of negative feedback because the response (recovery of water into the blood) counteracts the initial change (dehydration).

3. **a positive feedback mechanism** - No, this is not a positive feedback mechanism, as positive feedback amplifies a response and moves the system away from its set point, which is not the case here.

4. **organization of living things** - This can be considered somewhat relevant, as it relates to the biological system's organization and function, but it is not the primary focus of the process being described.

So, the correct selections are:
- a homeostatic mechanism
- a negative feedback mechanism