MCQ
Nerve impulse initiates with the movements of
- A${K^ + }$
- B$M{g^ + }$
- C$C{a^ + }$
- ✓$N{a^ + }$
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($i$) It is made of a single thin layer of flattened cells with irregular boundaries.
($ii$) They are found in the walls of blood vessels and air sacs of lungs.
($iii$) They are involved in functions like forming a diffusion boundary. Which of the following characteristics of tissue is being described by the above statements?