Breathe in Breathe out You’re using a system Turn on a faucet You’re using a system Take a ride on your bike You’re pedaling a system A system is a group of parts that work together to make something happen Each part of a system has its own job to do If one part doesn’t work right the whole system will fail The parts depend on each other like members of a team Large and small systems make the world work There are systems in the world of nature There are systems that scientists and engineers invented to make our lives easier safer and more fun Space Cat and her friend Dog will tell you where to find them starting with the systems that make you work Look for important new words in bold letters Look for systems in red letters How many did you find 3
You breathe thousands of times a day It happens so often you probably don’t even notice Good thing your lungs are paying attention When you breathe in air travels to your lungs The air holds oxygen which all living creatures need to survive Oxygen mixes with your blood and fills it with energy 4
Did You Know Space Cat Your nose mouth and lungs are parts of your respiratory RESS-purr-uh-tore-ee system You breathe at least 12 times every minute Dog Dogs breathe more than 20 times a minute 5
