Unit: Failure of Homeostasis
Lesson: Introduction to Dynamic Equilibrium and Feedback
Do Now: Formative Assessment. The assessment will help us determine what things we need to
focus for this next unit. Answer the questions as best as you can. If you don’t try we will not know
what skills you already have and we will have to go over these skills again! Good Luck!
Aim: How do feedback mechanisms help maintain homeostasis?
Lesson Opening: Recall what we learned so far about homeostasis. Write your answers on the
worksheet.
1. What is homeostasis? Ans. Homeostasis is to maintain a stable internal environment.
2. Make a list of ways organisms maintain homeostasis. Ans. Fever – Sweating, Body gets cold –
Shiver, Osmosis and Diffusion through the Cell Membrane – Equilibrium
Standards:
New York City High School Science Performance Standards
S2f. Demonstrates an understanding of behavior of organisms.
S4. Demonstrates an understanding of big ideas and unifying concepts.
S5f.Works individually and in teams to collect and share information and ideas
CCSS
- Defining unfamiliar vocabulary
- Determining what’s important in a text and diagram
- Organize complex ideas, concepts, and information
Performance Objectives: Students will be able to (SWBAT):
1. Identify dynamic equilibrium in a graph.
2. Define feedback mechanism given a diagram.
Development of Lesson:
1) Give Formative Assessment.
2a) Handout the worksheet and instruct students to answer the questions in the Recall section.
CTQ: What is homeostasis?
CTQ: Make a list of ways organisms maintain homeostasis.
b) Go over recall questions. Cold call on students.
3a) Organisms maintain homeostasis by another way called feedback.
b) Read and annotate the passage on your own.
4) Pair Work:
- Examine diagram.
- Work with your partner to answer the questions.
- Be prepared to share with class.
CTQ: Why is dynamic equilibrium important for organisms?
CTQ: How is the thermostat analogy of feedback similar to the human body?
Vocabulary:
1. Dynamic Equilibrium – or “steady state;” small constant corrections that normally occur in an
organism required for survival.
2. Feedback Mechanism – a change in the dynamic equilibrium that causes a response to return back to
normal.
Materials List: powerpoint presentation, worksheet
Summary:
1. How do feedback mechanisms help maintain homeostasis?
Homework:
Feedback mechanisms in Humans and Plants WS.