Positive and Negative Feedback Loops

The video explains positive and negative feedback loops, using examples like speed limit signs and homeostasis. It covers how mammals regulate temperature through negative feedback and how positive feedback is seen in fruit ripening and childbirth. The video also discusses blood glucose regulation and the impact of diabetes on feedback loops.

What is a negative feedback loop?

• A process that always leads to system failure

• A process that has no effect on the system

• A process that stabilizes around a target set point

• A process that amplifies changes

How does a positive feedback loop differ from a negative feedback loop?

• It stabilizes the system

• It amplifies changes and moves away from the target set point

• It always leads to system failure

• It has no effect on the system

What is homeostasis?

• A type of positive feedback loop

• A stable internal environment maintained by organisms

• A process of amplifying changes

• A method of external temperature regulation

How do ectotherms regulate their body temperature?

• By consuming more food than endotherms

• By maintaining a constant internal temperature

• By matching their internal temperature to the external environment

• By using positive feedback loops

What role does the hypothalamus play in temperature regulation?

• It secretes insulin

• It senses temperature changes and initiates responses

• It causes fruit ripening

• It produces ethylene

Which of the following is an example of a positive feedback loop?

• Blood glucose regulation

• Water concentration regulation in paramecium

• Temperature regulation in humans

• Fruit ripening

What hormone is responsible for lowering blood glucose levels?

• Adrenaline

• Cortisol

• Insulin

• Glucagon

What happens in type 1 diabetes?

• The body produces too much insulin

• The alpha cells in the pancreas are destroyed

• The beta cells in the pancreas are destroyed

• The body becomes resistant to insulin

How can type 2 diabetes be managed?

• By administering insulin shots or using an insulin pump

• By consuming more high-fat foods

• By reducing physical activity

• By increasing glucagon production

What is the primary cause of type 2 diabetes?

• Autoimmune destruction of beta cells

• Excessive glucagon production

• Genetic mutations

• Diet and lifestyle factors