Exploring Homeostasis and Feedback Mechanisms

Mr. Anderson reviews homeostasis, explaining feedback loops, both negative and positive, and their roles in maintaining stability at various levels, from individual organisms to ecosystems. He discusses behavioral and physiological responses, thermoregulation, osmoregulation, and the impact of biotic and abiotic factors. The video also covers plant and animal defenses, cell differentiation, and how organisms sense their environment and evolve through natural selection.

What is the primary purpose of a feedback loop in biological systems?

• To produce more energy

• To increase the speed of metabolic reactions

• To maintain a constant internal environment

• To decrease the body's temperature

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

• Childbirth contractions

• Apple ripening

• Ethylene production in apples

• Body temperature regulation

What is a behavioral response in organisms?

• A response that only occurs in plants

• A response at the cellular level

• A response involving the whole organism

• A response within the body

Which of the following is a physiological response to heat?

• Flying to a cooler area

• Sweating

• Hibernation

• Migration

What hormone is secreted by the pancreas when blood glucose levels are high?

• Glucagon

• Insulin

• Cortisol

• Adrenaline

Where is body temperature primarily regulated in the brain?

• Cerebellum

• Hypothalamus

• Medulla oblongata

• Cerebrum

What is the main function of the kidney in osmoregulation?

• To secrete digestive enzymes

• To filter blood and regulate osmolarity

• To produce red blood cells

• To store glycogen

Which of the following is an abiotic factor?

• Plant competition

• Predator population

• Parasitism

• Carbon dioxide levels

How do plants typically respond to an infection?

• By producing antibodies

• By destroying and hardening cells around the infection

• By migrating to a new location

• By increasing their metabolic rate

What is the process called when a cell dies as part of normal development?

• Meiosis

• Mitosis

• Apoptosis

• Differentiation