Question

Provide an example of a positive feedback system.

Answer 1

Positive Feedback:

1. Positive feedback is a mechanism in which the end products of action lead to more of that action to occur in a feedback loop.
2. The stimulus, sensor, control centre, and effector are the four components of a positive feedback loop.
3. The body's equilibrium is known to be hampered by stimuli.
4. The sensor is responsible for detecting any changes in homeostasis.
5. Control centre is the component of the body that reacts to stimuli and takes appropriate action.

Example:

1. The menstrual cycle is a good example of positive feedback.
2. The hormone estrogen is created by the body prior to the process of ovulation within a woman's body.
3. The estrogen reaches the brain, where it causes the hypothalamus to release gonadotropin-releasing hormone (GnRH) and the pituitary gland to release luteinizing hormone (LH).
4. More estrogen is produced from the ovary in the presence of (LH), resulting in excessive GnRH and LH production.
5. This is an example of a positive feedback mechanism.