Describe one way your body maintains homeostasis.

Put page 1 of your homework packet out on your desk!

Agenda

• Feedback Mechanisms Notes (10 min)• Feedback Loops Video (15 min)• Homeostasis Review Practice (15 min)• Homeostasis Children’s Book (50 min)

How does your body actually maintain homeostasis

• Review: What is homeostasis?

Feedback Mechanisms

• Negative Feedback Mechanisms– The stimulus creates a response and then that

response is stopped

• Positive Feedback Mechanisms– The stimulus creates a response and then that

response keeps going

Negative Feedback Mechanisms Example

Negative Feedback Mechanism Example

• When you eat your blood sugar (glucose) levels increase

• This causes your pancreas to release insulin to absorb the extra blood glucose

• After blood sugar drops back to normal, insulin is not made anymore

Checkpoint

• Define ‘Negative Feedback Mechanism’ in your own words

Regulating Blood Sugar

Positive Feedback Mechanisms Example

• During childbirth, a hormone called oxytocin is released

• Oxytocin causes the uterus to contract

• As oxytocin levels increase, your brain signals to release even more oxytocin so your uterus contracts even more…

Oxytocin

Video

• https://youtu.be/CLv3SkF_Eag

Exit Ticket

• Why would negative feedback mechanisms be more common in our bodies than positive feedback mechanisms?