The Human Body Compared to a Fish Tank Homeostasis The Human Body Compared to a Fish Tank

Fish Tank Conditions in the tank must be kept constant, or the same, in order for the fish to stay healthy and survive

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

Main System Responsible Primary Organ Responsible Specific systems and organs in your body have specific roles in maintaining homeostasis Job Main System Responsible Primary Organ Responsible O2 levels up and CO2 levels down Nutrient levels up so you have energy Waste levels down Temperature constant Respiratory system lungs Digestive system small intestine Excretory system kidneys Integumentary and nervous system skin and brain

Fishbowl Human Body Function Glass tank Barrier- 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) Nervous Integumentary Muscles Digestive system

Stimulus 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? 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? 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: External Stimuli and Internal Stimuli

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? 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? One of the jobs of your nervous system is to sense changes in the environment (stimuli) and respond to them.

Examples of homeostasis Stimulus: your stomach is empty and your body needs fuel Response: your stomach growls

Examples of homeostasis Stimulus: bright light Response: your pupils get smaller

Examples 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 MORE NO LESS 10 words! Really, exactly ten words