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HOMEOSTASIS AND BODY SYSTEMS
Unit 4- Lesson 1
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What is homeostasis?
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Homeostasis is
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Maintain: _______________________
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Constant: ___________________________
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Internal: _____________________________
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Environment: ___________________________
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Controlling body temperature
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All mammals maintain a constant body temperature. Human beings have a body
temperature of about 98.6ºF. What happens if you get too hot?
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When your body is hot,
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What happens when we get too cold?
 We get “goose bumps” and the hairs on our skin “stand up".
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 We shiver. _______________________________________________________
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What is this little boy doing?
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He is eating his Purim goodies.
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What do you think is happening to the glucose levels in his body?
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Here, the endocrine system (hormones) is sending messages.
After you eat, your blood sugar (glucose) rises. This rise in glucose
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____________________. _______________________________________________.Insulin travels
through the blood to your body's cells. It tells the cells to open up and let the glucose in. Once inside,
the cells convert glucose into energy.
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How do our body systems work together?
What if our body sensed danger? What body systems would be affected?
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Negative feedback is when
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Positive feedback ______________________________________________________________.
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Examples of Positive Feedback
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A baby begins to suckle her mother's nipple and a few drops of milk are released (the stimulus).
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This encourages the baby and releases a hormone in the mother which further stimulates the
release of milk (the response).
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The hungry baby continues to suckle, stimulating more milk release until she stops.
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Important Vocabulary Words
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Stimulus: _______________________________________________
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Response: __________________________________
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