Question

1. what is thermoregulation? what part of the brain controls this process? 11. explain what a negative feedback loop is and give an example other than thermoregulation. 12. explain what a positive feedback loop is and give an example other than childbirth.

Explanation:

1. Thermoregulation is the process by which organisms maintain a stable internal body - temperature. The hypothalamus in the brain controls this process. It acts as a thermostat, detecting changes in body temperature and initiating responses such as sweating (to cool down) or shivering (to warm up).
2. A negative - feedback loop is a regulatory mechanism where the output of a process reduces the initial stimulus. For example, in blood glucose regulation, when blood glucose levels rise, the pancreas secretes insulin, which causes cells to take up glucose, reducing blood glucose levels back to normal.
3. A positive - feedback loop is a regulatory mechanism where the output of a process amplifies the initial stimulus. For example, in the blood - clotting process, when a blood vessel is damaged, platelets are activated. Activated platelets release chemicals that attract more platelets, leading to the formation of a blood clot.

Answer:

1. Thermoregulation is the maintenance of stable internal body - temperature, controlled by the hypothalamus.
2. A negative - feedback loop reduces the initial stimulus. Example: Blood glucose regulation by insulin.
3. A positive - feedback loop amplifies the initial stimulus. Example: Blood - clotting process.