Question

Control of thirst response due to increased plasma osmolarity by a negative feedback loop rank from the first to the last steps to describe the correct order of events to maintain homeostasis.

Answer 1

Thirst response is controlled by the master of all endocrine gland i.e. the hypothalamus. The increase in the osmolarity of the cells causes the hypothalamus to trigger the thirst response. This is subsidized by fluid intake which helps in operating the feedback loop.

Further Explanation:

Feedback mechanism is the process by which the body tries to maintain a homeostasis. They are of two types,

a. Positive Feedback Loop

b. Negative Feedback Loop

Positive feedback loop is the self-regulating process in which the increase in input decreases the output. A sufficient decrease in the output leads to decrease in input.

Negative feedback loop is a self-regulating cycle in which the increase in input increases the output. The increase in output regulates the level of input.

Hypothalamus is the master endocrine gland that plays a vital role in maintaining homeostasis that is a stable condition inside the body.

The control of thirst response is carried out in the following manner,

i. The increase in osmoregularity of the cells.

ii. This increase is detected by the control center in the brain i.e. hypothalamus.

iii. Hypothalamus triggers the thirst response.

iv. The triggering helps in increasing the fluid intake.

v. The fluid intake is detected and the osmoregularity comes back to normal.

vi. The hypothalamus detects the change in osmoregularity.

vii. The change detected leads to decrease in thirst response.

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Answer Details:

Grade: College biology

Subject: Biology

Chapter: Homeostasis

Keywords:

Homeostasis, hypothalamus, fluid, Fluid intake, Brain, master endocrine gland, feedback mechanism, negative feedback loop, feedback loop, endocrine gland.