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Respiratory System

2   3 4
6           7

5.Also known as the windpipe
6.the part of the face or facial region in humans and certain animals that contains the nostrils and the organs of smell and functions as the usual passageway for air in respiration: in humans it is a prominence in the center of the face formed of bone and cartilage, serving also to modify or modulate the voice.
8.either of the two main branches of the trachea.
9.either of the two saclike respiratory organs in the thorax of humans and the higher vertebrates.
1.the opening through which an animal or human takes in food.
2.a muscular and cartilaginous structure lined with mucous membrane at the upper part of the trachea in humans, in which the vocal cords are located.
3.a muscular, membranous or ligamentous wall separating two cavities or limiting a cavity.
4.gaseous chemical element.
7.a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere.

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