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What location in the body utilizes a ciliary escalator as a defense mechanism? a. colon b....

What location in the body utilizes a ciliary escalator as a defense mechanism?

a. colon

b. ear canal

c. urinary tract

d. respiratory tract

e. eyes
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Answer #1

Correct option is - d. respiratory tract

Explanation-

The epithelial surface of respiratory tract gets exposed to a number of pathogens ranging from viral to bacterial to any others as we inhale and exhale the air. Thus, a proper defence mechanism is required to provide immunity to the host. In respiratory tract. the first or physical barriers to these pathogens come from the action of mucous (generally released from goblet cells) and the cilia from ciliary-epithelial cells. During this defence mechanism the pathogens gets stuck in the mucous followed by the ciliary escalator mechanism used by ciliated cells to move up and out those trapped pathogens. Thus, respiratory tract is the location in the body utilizes a ciliary escalator as a defence mechanism. Hence, the correct option is d. respiratory tract.

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