Post on 06-Jan-2018
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Homeostasis
The Human Body Compared to a
Fish Tank
Conditions in the tank must be kept constant, or the same, in order for the fish to stay healthy and survive
Fish Tank
In order for the fish to survive the fish tanks must maintain:
warm temperature: ~78 degrees Fahrenheit
high nutrient level: food for the fish, plants and bacteria
high oxygen (O2) level and low carbon dioxide (CO2) level:for the fish to “breath”
low nitrogen-waste level: poisonous for the fish
How do we maintain stable conditions in a tank?
• Heater : temperature• Feeding the fish daily : nutrient levels• Air pump : oxygen• Filters : removes waste• Plants : carbon dioxide• Cleaning the tank : removes waste
Specific systems and organs in your body have Specific systems and organs in your body have specific roles in maintaining homeostasisspecific roles in maintaining homeostasis
Job
• O2 levels up and CO2 levels down
• Nutrient levels up so you have energy
• Waste levels down
• Temperature constant
Main System Responsible Primary Organ Responsible
• Respiratory system• lungs
• Digestive system • small intestine
• Excretory system• kidneys
• Integumentary and nervous system • skin and brain
Fishbowl Human Body
Function
Glass tankBarrier- keep certain things inside and certain things outside
Air pump Keep O2 level stable: high
Filter Keeps waste level stable: low
Heater Keep temperature stable
Feeder Keep nutrient level stable: high
Integumentary (Skin)
Respiratory (Lungs)
Excretory (Kidneys)
NervousIntegumentary
Muscles
Digestive system
Stimulus and ResponseStimulus and Response
Why animals and plants do what they do OR
A fancy way of saying cause and effect in science.
What is a stimulus?What is a stimulus?
Stimulus: any change in an organism’s environment that causes to the organism to react. It is a fancy way of saying “cause”.
Stimulus – singular Stimuli – plural
Example: You are hot and begin to sweat.
What is a response?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.
There are two types of stimuli:There are two types of stimuli:
External Stimuliand
Internal Stimuli
What is an external stimulus?What is an external stimulus?
External stimulus: a stimulus 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 the rabbit runs away.3. A dog feels hot so it goes to lay in the shade.
What is an internal stimulus?What is an internal stimulus?
Internal stimulus: a stimulus 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. You feel sick and vomit.
Which organ system is responsible? Which organ system is responsible?
• One of the jobs of your nervous system is to sense changes in the environment (stimuli) and respond to them.
Examples of homeostasisExamples of homeostasis
Stimulus: your stomach is empty and your body needs fuel
Response: your stomach growls
Examples of homeostasisExamples of homeostasis
Stimulus: bright lightResponse: your pupils get smaller
Examples of homeostasisExamples of homeostasis
Can you think of anymore?Brainstorm with your table and fill in the chart
with examples 5-7
Exit Ticket
Explain homeostasis in exactly ten words
NO MORENO LESS10 words!
Really, exactly ten words