Question:

The cavities of alveoli of lungs are lined by

Updated On: Jun 6, 2022
  • cuboidal epithelium
  • columnar epithelium
  • stratified cuboidal epithelium
  • squamous epithelium
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The Correct Option is D

Solution and Explanation

There are $300$ millions of alveoli (also called acini) in two lungs. The alveoli have very thin wall consisting of squamous epithelium. The wall of alveoli has an extensive network of blood capillaries interspersed with elastic and reticular connective tissue fibres. Due to very intimate contact of blood capillaries with the alveoli, the exchange of gases takes place easily.
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Concepts Used:

Animal Tissues

Human bodies, like most animal bodies, are made up of four different types of tissue:

Epithelial Tissue:

This tissue forms the outer layer of the body and also lines many of the body's cavities where it has a protective function.

General functions of epithelial tissue:-

  1. Provides a barrier between the external environment and the organ that it is covering.
  2. Specialized to function in secretion and absorption.
  3. Protects organisms from microorganisms, injury, and fluid loss.

Connective Tissue:

This tissue assists in the support and protection of organs and limbs and depending on the location in the body it may join or separate organs or parts of the body.

Muscle Tissue:

This tissue enables various forms of movement, both voluntary and involuntary.

Nerve Tissue:

This tissue is responsible for the carrying of electrical and chemical signals and impulses from the brain and central nervous system to the periphery, and vice versa.