Homeostasis Feedback Coloring Sheet

Cellular Control Systems — Year 12 Science

Name:

Date:

🎨 Part 1: Color the Feedback Loop Diagrams

Directions: Read each diagram description carefully. Use the color key to shade each part of the feedback loops below. Then answer the questions that follow.

🖍️ Color Key:

BLUE = Stimulus RED = Receptor GREEN = Control Center ORANGE = Effector YELLOW = Response

Diagram A — Negative Feedback Loop (Body Temperature)

Color each box using the color key above. Draw arrows connecting the boxes in order.

Label these parts in Diagram A: Body temperature rises → Thermoreceptors detect change → Hypothalamus sends signal → Sweat glands activated → Temperature returns to 98.6°F

Diagram B — Positive Feedback Loop (Childbirth)

Color each box using the color key above. Draw arrows showing how the response amplifies the stimulus.

Label these parts in Diagram B: Baby pushes on cervix → Stretch receptors signal brain → Oxytocin released → Stronger contractions → More pressure on cervix (cycle continues until birth)

📚 Part 2: Key Concepts — Multiple Choice

1. Homeostasis is best defined as:

A. The process of cell division

B. The body's ability to maintain a stable internal environment

C. The movement of molecules across a membrane

D. The conversion of DNA into protein

2. In a negative feedback loop, the response:

A. Amplifies the original stimulus

B. Has no effect on the stimulus

C. Reverses or reduces the original stimulus

D. Triggers a new, unrelated process

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

A. Blood glucose regulation by insulin

B. Body temperature regulation through sweating

C. Oxytocin release during childbirth

D. Calcium regulation in the blood

4. The control center in a feedback loop (such as the hypothalamus) is responsible for:

A. Detecting the initial change in the body

B. Carrying out the physical response

C. Receiving and processing information, then directing a response

D. Storing genetic information

5. Check ALL components that are part of every feedback loop:

Stimulus

Receptor

Control Center

Effector

DNA replication

Response

✏️ Part 3: Short Answer

6. Fill in the blanks using the word bank below:

Word Bank: negative, positive, homeostasis, effector, receptor, amplifies, reverses

The body's ability to maintain internal balance is called ___________________. A ___________________ feedback loop ___________________ the original stimulus, while a ___________________ feedback loop ___________________ it back toward normal. The organ or tissue that carries out the corrective response is called the ___________________.

7. In your own words, explain the difference between negative and positive feedback. Give one real-life body example of each.

8. The normal human body temperature is 98.6°F. If you go outside on a hot day and your temperature begins to rise, describe the steps your body takes to return to homeostasis. Identify the stimulus, receptor, control center, effector, and response.

🌟 Reflection: Why is it important for the body to use mostly negative feedback loops rather than positive feedback loops to maintain homeostasis? Write your answer below.