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3rd Grade Natural Science: Unit 3 Review
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The _______ system eliminates waste from the body.
excretory
What carries blood cells around the body?
blood vessels
What pumps blood around the body in the blood vessels?
the heart
The _______ system transports nutrients and oxygen around the body.
circulatory
What are the two air tubes in the lungs called?
the bronchi
What is the big tube called that moves air to and from the lungs?
the windpipe
What are the tiny air sacs called where gas exchange happens?
the alveoli
What protects the lungs?
the rib cage
Where are our vocal cords?
in the voice box
Exhalation occurs when we exhale _______ _______.
carbon dioxide
_______ occurs when we inhale oxygen.
Inhalation
What teeth are used for tearing food?
the canines
What teeth are used for cutting?
the incisors
How many milk teeth do small children have?
20
What part of the digestive system uses gastric juices and muscles to break down food into smaller pieces?
the stomach
What is the long, narrow tube called where nutrients pass into the bloodstream?
small intestine
The _______ takes the soft bolus from the mouth to the oesophagus.
pharynx
What is the name of the tube that pushes food from the pharynx to the stomach?
the oesophagus
The tongue and saliva break down food and form a _______.
bolus
What is the process of breaking food into nutrients?
digestion


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