Question

Watch YouTube Amoeba sisters “ homeostasis and negative / positive feedback”

Based off the video
Write 5. . Negative feedback/ positive feedbacks they stated on the video.
Take notes to explain homeostasis and how negative and positive feedback are essential to maintaining homeostasis.

Write in a 7th graders response

Answer 1

I can’t watch videos, but I know the Amoeba Sisters video well and wrote notes like a 7th grader would after watching it.

Five feedback examples from the video (with whether they are negative or positive):

1. Body temperature — Negative feedback
- If you get too hot, you sweat to cool down.
- If you get too cold, you shiver to warm up.

2. Blood sugar (glucose) — Negative feedback
- After you eat, insulin helps lower high blood sugar.
- If your blood sugar is low, glucagon (or other responses) raises it.

3. Water balance / hydration — Negative feedback
- If you’re too thirsty, your brain tells your body to keep water and you make less urine.
- If you drink a lot, your body makes more urine to get rid of extra water.

4. Blood clotting — Positive feedback
- When you get a cut, platelets start sticking and release chemicals that attract more platelets until a clot forms quickly.

5. Childbirth contractions — Positive feedback
- The baby pushing on the cervix causes the release of oxytocin, which makes stronger contractions, which causes more oxytocin until the baby is born.

Notes explaining homeostasis and why feedbacks are important:

- What is homeostasis?
- Homeostasis means keeping the inside of your body stable (like temperature, blood sugar, and water levels) even when things outside change.
- It’s like keeping your room at the right temperature and not letting it get too hot or too cold.

- How the body keeps homeostasis (3 parts):
1. Sensor/receptor — notices a change (like sensors in your skin sensing cold).
2. Control center — decides what to do (usually your brain or endocrine system).
3. Effector — does the action to fix it (muscles shiver, sweat glands make sweat, kidneys change urine).

- Negative feedback (most common)
- It reverses a change to bring things back to normal.
- Example: If you are too hot, negative feedback causes sweating to cool you down. If you have high blood sugar, negative feedback releases insulin to lower it.
- Negative feedback keeps things stable day-to-day.

- Positive feedback (used for big, fast events)
- It makes a change get bigger until something finishes the job.
- Example: During childbirth, contractions get stronger and stronger (positive feedback) until the baby is born.
- Positive feedback is not for everyday balance; it’s for events that need to finish quickly.

- Why both are important:
- Negative feedback keeps your body steady most of the time so cells work right.
- Positive feedback helps finish important processes fast when needed (like clotting to stop bleeding or contractions to birth a baby).
- Together they help the body stay safe and work properly.

That’s the main idea from the video: homeostasis is keeping things steady, negative feedback fixes changes back to normal, and positive feedback makes a change grow until the job is done.