Feedback Loops

Feedback Loops

​Do Now

Recap of last lesson:

• We learned what homeostasis is and how our bodies are very picky about keeping our internal environment the same, even though the outside environment may change.

• We also learned that a negative feedback loop is how most body levels stay within the right range - if our body senses something is too high or low it does the opposite to bring it back to normal.

Some new words:

• Endocrine System

• Electrical Impulses

• Hormones

​Activity
Glue the sheet into your books and match the words to their definitions!​

• Receptors

• Coordination centre

• Effectors

• Nervous System

Is there such this as positive feedback?

In a negative feedback loop, our bodies notice something and do the opposite to bring it back to normal. The see saw doesn't happen for every body process though.

​Positive feedback: A change makes more of the same thing happen, growing bigger and stronger. Unlike negative feedback, it doesn’t bring things back to normal but keeps the change going.

Categorize

Options (8)

Sweating to cool down when hot.

A microphone squealing louder and louder.

Shivering to warm up when cold.

A baby crying louder when given attention.

A thermostat turning off the heater when a room gets warm.

Ripening apples releasing gas to ripen more apples.

Heart rate speeding up during exercise, then slowing down after.

A snowball getting bigger as it rolls downhill.

State whether the following scenarios are examples of positive or negative feedback.

Positive

Negative