Name: ___________________________________________________________ Date: _______________ Period: ______
Homeostasis Notes
Homeostasis
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Defined: Process where the body ___________________ a __________________ internal environment
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Importance: Internal __________________ & ___________________ work best in ___________________ conditions
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_________________ systems ________________ to internal/external ___________________
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What’s controlled? ______________________, fluids, _________
Control Systems
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Sensors (aka: ____________________)
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Gather ___________________ about the body and ________________________
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Ex: skin senses ___________________
Communication Center
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_________________ sent throughout the body to ___________________
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Ex: _________________ travel through your ____________________
Control Center
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_________________ information from the _____________________
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Ex: Brain ___________________ the impulse
Targets
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Body part that _________________ its ___________________
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Ex: ________________ in hand stretch/_________________ abruptly
Negative Feedback Loops
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Regulates ____________ of the ____________
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Defined: Process where your body _____________
a _________________ that is occurring
–
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Ex: if your temperature __________…
Positive Feedback Loops
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Defined: process where your body
_______________________________ change
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Important when _____________ change is needed
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Ex: Pregnancy contractions
you will shiver to generate ____________
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Uterus __________________ begin slowly
Ex: If your temperature __________…
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_______________ released to speed ____
you will sweat to _____________ down
the ___________________
Working Together
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Thermoregulation: Maintenance of body ________________________
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Skin: _________________ detect _____________
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___________________ system: electrical impulse sent to ____________________
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___________________ system: releases __________________ into __________________ stream
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Muscles: Hormones cause ____________________
Homeostasis Disruption
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Some disruptions ___________________
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Infections, _______________, sore throats, muscle __________________
Some disruptions too _______________ for your body to _________________
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_______________ bite: Sensors are __________________
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_______________: Messages from _________________ doesn’t reach ____________________
Normal Insulin Production
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Cells needs ___________________
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_____________________ uses glucose to make __________ energy
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After _____________, glucose levels in the __________________ increase
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But the ________________ (doors) that allow glucose into your ______________ are _________________
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Your ________________ responds by releasing __________________ into the blood ________________
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Insulin causes the _________________ (doors) to _____________
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Glucose _______________ into the ____________, giving them much needed ________________
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Glucose level in blood ________________ to ___________________
Diabetes
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Cells needs glucose
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Mitochondria uses glucose to make ATP energy
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After meals, glucose levels in the blood increase
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But the channels (doors) that allow glucose into your cells are closed
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A _______________ pancreas will often release too _______________ insulin
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_________________ insulin causes only a ___________ channels (doors) to _______________
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Very little ________________ can ________________ into the _______________
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The glucose _______________ in the blood _______________ returns to _________________
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Hours later, the next _____________ adds even more ___________________
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Ironically, the cells begin to __________________ even though food is _________________
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The blood becomes ____________________
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Negative effects: _______________ disease, ____________ blood pressure, _______________, ________________
Diabetes Treatment
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Insulin _________________
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Insulin causes the channels to ____________ and allows _______________ to enter the ______________
Practice Quiz
1) Define homeostasis.
2) Name and describe the four parts of the “control system.”
3) What is negative feedback?
4) What is positive feedback?
5) Is the following example positive or negative feedback?
During heavy exercise your body loses water when you sweat. As a
result of water loss, your body redirects the remaining water to vital
parts of your body to replenish these vital organs.
6)
7)
8)
What is diabetes?
Which organ releases insulin?
What happens when glucose levels are too high in the blood?