Homeostasis

Homeostasis

Discussion

• What changes do you notice in your body when it gets hot outside?

• What about when it gets cold outside?

• What would happen if these things didn't occur?

Our bodies like balance

Our bodies are picky and have very specific ranges for things like our temperature, water levels, pH, and even blood sugars to be in. Being in this happy zone is called 'homeostasis'.

Homeostasis: The ability of the body to maintain a stable internal
environment despite changes in external conditions.
refers to the ability of the body to maintain a stable internal environment despite changes in external conditions.

Multiple Choice

The narrator of the video mentioned some important factors our bodies like to keep balanced. Which of the options below did he NOT mention?

• pH

• Temperature

• Glucose

• Nutrition

Multiple Select

Our body is made up of lots of systems. What TWO systems did the narrator say help us to keep balanced?

• Digestive

• Nervous

• Cardiovascular

• Endocrine

• Respiratory

Let's sum that up

Some key factors our body likes to keep balanced are pH, temperature, glucose (sugar), and electrolytes (salt).

The two main systems that work to maintain homeostasis are the nervous system and endocrine system.

• What temperature do human bodies like being at?

• What changes did we say happen when it's too hot/cold outside?

• How could we draw this?

​

Let's go back to temperature

​

We just created a negative feedback loop!

Our body senses the balance is off and makes changes to do the opposite of what's wrong. For example, "I'm too hot. Let's do things to counteract the hot to make me cold."

Negative Feedback Loop: The action of restoring balance by reversing changes, happening continually back and forth.

Two more words for today:

The body’s action to restore balance.

Response:

A change in the environment that affects the body.

Stimulus:

​Now go and label your drawings with the stimuli and responses.

Side note: Every lesson we do goes towards your grade. The more lessons you complete, the less likely a bad lesson or assessment will pull down your overall mark.

Have you been paying attention?

Let's find out.

Multiple Choice

What is homeostasis?

• The process of rapid body growth

• The maintenance of stable internal conditions

• The body's ability to move quickly

• The process of breaking down food

Multiple Choice

Which of these is an example of homeostasis?

• Sweating when it's hot outside

• Eating food when you're hungry

• Running away from danger

• Sleeping when you're tired

Multiple Choice

What is the purpose of a negative feedback loop?

• To stop the body from reacting to changes

• To reverse changes and restore balance

• To increase the effects of a stimulus

• To permanently change the body's conditions

Multiple Choice

Which of these is a stimulus in homeostasis?

• Sweating to cool down

• A rise in body temperature

• Shivering to warm up

• The production of hormones

Reorder

Place the terms in the correct chronological order.

• Stimulus

• Response

• Homeostasis

1

2

3

• 1
• 2
• 3