Feedback Loops and Homeostasis in Biological Systems

Mr. Anderson's video on feedback loops covers the concepts of positive and negative feedback, using examples like speed regulation, temperature control in mammals, and fruit ripening. He explains homeostasis and how feedback loops help maintain a stable internal environment. The video also delves into the regulation of blood glucose levels, highlighting the role of insulin and glucagon, and discusses the implications of diabetes as a feedback loop error.

What is the main characteristic of a negative feedback loop?

• It has no target set point.

• It stabilizes around a set point.

• It amplifies changes.

• It moves away from equilibrium.

How do organisms maintain a stable internal environment?

• By ignoring external changes.

• Through feedback loops.

• By constantly changing their internal state.

• By relying solely on external conditions.

What is the role of vasodilation in temperature regulation?

• It prevents sweating.

• It helps in heat loss through the skin.

• It decreases blood flow to the skin.

• It increases body temperature.

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

• Childbirth contractions.

• Maintaining blood pressure.

• Temperature regulation in humans.

• Blood glucose regulation.

What hormone is responsible for fruit ripening in a positive feedback loop?

• Auxin

• Gibberellin

• Ethylene

• Cytokinin

What happens when blood glucose levels are too high?

• Glucagon is released.

• Blood glucose levels remain unchanged.

• The pancreas stops functioning.

• Insulin is released.

What is the primary issue in type 1 diabetes?

• Excess insulin production.

• Lack of glucagon production.

• Destruction of beta cells.

• Overactive alpha cells.

How can type 2 diabetes be managed?

• By avoiding all carbohydrates.

• By reducing physical activity.

• Through insulin shots or pumps.

• By increasing sugar intake.

What is the main cause of type 2 diabetes?

• Genetic mutations.

• Autoimmune destruction of cells.

• Diet and lifestyle factors.

• Viral infections.

What is the function of glucagon in blood glucose regulation?

• It lowers blood glucose levels.

• It converts glucose to glycogen.

• It raises blood glucose levels.

• It inhibits insulin production.