HomeostasisVocab

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Homeostasis Vocab

• April 14, 2016

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Starter

• When you go outside and the air is cold what do
  you normally do?
• What is the stimulus (cause) in this scenario?
  Stimulus
• What is the response (effect) in this scenario?
  Response

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Practice Stimulus and Response

• Why animals and plants do what they do
• OR
• A fancy way of saying cause and effect in the
  animal world.

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What is a stimulus?

• Stimulus any change in an organisms environment
  that causes the organism to react. It is a fancy
  way of saying cause.
• Stimulus singular
• Stimuli plural
• Example An animal is cold so it moves into the
  sun.

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What is a response?

• Response how the organism reacts to a stimulus
  and results in a change in behavior. It is a
  fancy way of saying effect.
• Example Getting a drink when you are thirsty.

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Examples of stimuli and their responses

• You are hungry so you eat some food
• A rabbit gets scared so it runs away
• You are cold so you put on a jacket
• A dog is hot so lies in the shade
• It starts raining so you take out an umbrella
• Make up your own and share with partner they
  will identify stimulus and response!

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Plants also respond to their environment. When a
plant grows towards the sun we call this
phototropism.
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Homeostasis

• The bodys ability to regulate its inner
  environment in response to changes in the outside
  environment

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There are two types of stimuli

• External Stimuli
• and
• Internal Stimuli

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External Stimulus

• External stimulus a stimulus (cause) that comes
  from outside an organism.
• Examples
• 1. You feel cold so you put on a jacket.
• 2. A snake lunges at a rabbit so it runs away.
• 3. A dog feels hot so it goes to lay in the
  shade.

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Internal Stimulus

• Internal stimulus a stimulus (cause) that comes
  from inside an organism.
• Examples
• 1. You feel hungry so you eat some food.
• 2. A cat feels thirsty so it drinks water.
• 3. Feel heart pain so you see a doctor.
• 4. You feel sick so you vomit.

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• Learned behavior a response to a stimulus that
  an animal or organism was taught.

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• Instinct an animals natural reaction to a
  stimulus. It is an automatic reaction that the
  animal or organism was not taught to do.
• -You are born knowing how to do something!
• Add this word to your vocabulary book

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