Accessory Organ Roles

Grade Level

12th Grade

Duration

30 minutes

Unit

Digestive System Dynamics (Lesson 3 of 4)

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NGSS Alignment

Performance Expectations:

• HS-LS1-3: Plan and conduct an investigation to provide evidence that feedback mechanisms maintain homeostasis.
• HS-LS1-2: Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.

Disciplinary Core Ideas (DCI):

• LS1.A: Structure and Function – Systems of specialized cells within organisms help them perform the essential functions of life.
• LS1.C: Organization for Matter and Energy Flow in Organisms – Food provides energy and building materials for organisms.

Science and Engineering Practices (SEP):

• Developing and Using Models
• Constructing Explanations and Designing Solutions

Crosscutting Concepts (CCC):

• Structure and Function
• Systems and System Models

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Learning Objectives (I can statements)

• I can describe the functions of the salivary glands, pancreas, and liver as accessory organs of the digestive system.
• I can explain how each accessory organ contributes to digestion and maintaining homeostasis.
• I can collaborate effectively in a group to create and deliver a clear presentation on organ function.

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Success Criteria

• Accurately identify and explain the roles of at least three accessory organs involved in digestion.
• Create a clear and concise group presentation that demonstrates a connection between organ structure and function.
• Use scientific vocabulary related to the digestive system correctly during the presentation.
• Show teamwork and equitable participation during the group activity.

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Materials

• Whiteboard and markers
• Poster boards or digital presentation tools (Google Slides/PowerPoint)
• Individual student notebooks or digital devices for note-taking
• Diagram handouts of the digestive system highlighting accessory organs
• Access to brief scientific texts or curated handouts about salivary glands, pancreas, and liver (pre-prepared)

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Lesson Procedure

1. Introduction & Objective Overview (5 minutes)

• Begin with a brief recap of the digestive system focusing on what was covered in previous lessons (main organs).
• Introduce the accessory organs: salivary glands, pancreas, and liver.
• Clearly state the “I can” objectives on the board.
• Connect these objectives to the NGSS framework emphasizing systems and structure-function relationships.

Teacher Prompt:
“Today, we will explore how these accessory organs play crucial, yet sometimes hidden, roles in digestion. Understanding these helps us see the bigger picture of how our bodies maintain balance.”

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2. Group Activity: Collaborative Research & Presentation Preparation (15 minutes)

• Divide the class into 3 groups (4-5 students each), assigning each group one of the accessory organs.
• Provide each group with focused reading materials/handouts on their assigned organ.
• Each group will:
  • Identify the organ’s function(s) in the digestive process
  • Explore its contribution to homeostasis (e.g., pancreas releasing insulin, liver detoxification)
  • Design a 3-4 minute presentation using a poster or digital slides to explain their organ’s role clearly and creatively
• Circulate among groups to facilitate discussion, clarify concepts, and ensure scientific accuracy.

Differentiation Tip:
Assign roles in each group—researcher, designer, speaker, note-taker—to ensure engagement and deeper understanding for all students.

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3. Group Presentations & Peer Feedback (8 minutes)

• Each group presents their findings to the class (3-4 minutes per group).
• Encourage peer note-taking, asking students to write down 2 key facts from each presentation.
• After each presentation, allow 1-2 quick questions from classmates.
• Offer positive reinforcement and correct misconceptions immediately.

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4. Closing and Formative Assessment (2 minutes)

• Recap the key functions of the salivary glands, pancreas, and liver with a quick class discussion.
• Ask individual students to complete a quick exit ticket with 1) one new thing they learned about an accessory organ, and 2) one question they still have.

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Assessment

• Observation checklists during group work to assess collaboration and engagement.
• Evaluation of group presentations using a rubric focused on scientific accuracy, clarity, and use of scientific terminology.
• Exit tickets to gauge individual understanding and inform instruction for lesson 4.

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Extensions & Enrichment

• For advanced learners: challenge them to connect accessory organ functions to diseases (e.g., diabetes and pancreas; liver cirrhosis).
• For deeper inquiry: prompt students to model feedback mechanisms of these organs for homeostasis using diagrams or digital simulations.

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Teacher Reflection Notes

• Monitor if students understood the difference between primary digestive organs and accessory organs.
• Note participation levels and adapt group roles if necessary for improved collaboration in the next lesson.
• Gather common questions for review to clarify in lesson 4.

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This plan balances scientific rigor with active learning aligned to NGSS, promoting student ownership of understanding complex systems within a compact 30-minute window.