5th Grade Science

Term Definition
Nose Respiration begins here. It gets the air ready for the lungs. It moistens and cleans the air.
Mucus A thick, sticky liquid made in the nose. Its job is to trap dust and germs.
Trachea Also known as the windpipe. The tube that goes from the nose to the lungs.
Where does your body make mucus? Nose, mouth, throat, trachea, eyes, and ears
Cilia Tiny hairs that move particles of dust and germs from the trachea to the throat through mucus.
Respiratory system The group of organs that takes oxygen from the air and removes carbon dioxide from you body.
What do blood vessels in the nose do? They warm the air.
Diaphragm The large muscle below the lungs that helps you breathe.
Blowing your nose helps you get rid of what? Germs that are trapped in mucus.
Exhale Breathing air out.
Inhale Breathing air in.
When we breathe, what fraction of air is oxygen? One fifth (1/5)
Path of the Respiratory System Nose > Trachea > Bronchial Tubes > Lungs > Air Sacs > Diaphragm
Bronchial tubes Each tube goes into each lung
In the lungs, the bronchial tubes divides into smaller and smaller tubes called ______? Bronchia
Air Sacs The smallest bronchia that are clusters of tiny pouches. They are hollow.
CO2 Carbon Dioxide
What are responsible for exchanging carbon dioxide for oxygen in the lungs? Air sacs
Where does the oxygen go after it leaves the air sacs? The oxygen goes to the blood vessels.
Red blood cells Delivers the oxygen to and from all of the cells in our body.
Where are the intercostal muscles located? Between the ribs.
When the intercostal muscles and diaphragm contract what does this allow? Space in the cavity for the lungs to fill up with air.
Capillaries Tiny blood vessels. They are so narrow that the blood cells go through in a single file line.
Destruction of air sacs from smoking cigarettes causes what health condition? Emphysema
Chronic bronchitis and asthma is caused when _____. Too much mucus is made making the passage way gets smaller. The air has a harder time to get through.
How do red blood cells float? They float in plasma.
How do cells get energy? They break down nutrients.
What carries blood away from the heart? Arteries
What carries blood to the heart? Veins
Oxygen-rich blood is this color. Bright red
Deoxygenated blood is this color. Dark, dull, purplish
Your body needs this for every activity (sleeping, running, playing, learning) ENERGY
Cells use energy to help you grow by doing this. Divides into more cells and repair damaged cells
Respiration equation sugar + oxygen >carbon dioxide + water + energy

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