Copyright

Feedback in Biological Systems Lesson Plan

Instructor: Adrianne Baron

Adrianne has a master's degree in cancer biology and has taught high school and college biology.

Feedback systems regulate every system in our bodies. Your students will learn about feedback systems as they watch a video, illustrate examples of feedback systems and complete a worksheet.

Learning Objectives

At the completion of this lesson students will be able to:

  • define feedback system
  • identify a positive and negative feedback system
  • explain how positive and negative feedback systems work

Length

1.5 - 2 hours

Curriculum Standards

  • HS-LS1-3

Feedback mechanisms maintain a living system's internal conditions within certain limits and mediate behaviors, allowing it to remain alive and functional even as external conditions change within some range. Feedback mechanisms can encourage (through positive feedback) or discourage (negative feedback) what is going on inside the living system.

Materials

  • Computer with projector
  • Copies of the lesson worksheet
  • Legal -size printer paper
  • Colored pencils
  • Student computers
  • Index cards with the names of a positive and negative feedback system on each card. (The cards should not have the names of the same feedback systems.)

Instruction

  • Begin this lesson by telling your students that every system in their bodies knows when to do or stop doing their functions based on signals from the nervous and endocrine systems. These signals are coordinated to ensure proper functioning of the body.
  • Tell your students they will know more about these systems of signaling after they watch the Positive & Negative Feedback in Biological Systems video.
  • Play the video for your students and pause it for periodic discussions throughout the video.
  • Start the video from the beginning and pause it for the first time at 1:39 to ask and discuss the following:
    • What is a feedback system?
    • What is a stimulus in a feedback system?
    • What is an effector of a feedback system?
    • During which stage of a feedback system does a response to the change occur?
    • What happens when all four stages of a feedback system have been completed?
  • Continue playing the video and pause it again at 2:54 to ask and discuss the following:
    • What is a positive feedback system?
    • What causes positive feedback systems to be activated?
    • What are some examples of a positive feedback system?
  • Continue playing the video for your students and pause it one last time at 4:47 to ask and discuss the following:
    • What is a negative feedback system?
    • How do negative feedback systems help to maintain homeostasis?
    • What are some examples of negative feedback systems?
  • Play the remainder of the video for your students and answer any questions they may have at this point.

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