what does lungs mean?

[Riot]

English Language Tests, Intermediate level

ESL/EFL Test #307 "English Slang Idioms (29)", question 4

He had to shout at the top of his ......... to get his wife to notice him when she was in the garden.

(a) mouth
(b) form
(c) game
(d) lungs

English Language Tests, Intermediate level

ESL/EFL Test #307 "English Slang Idioms (29)", answer 4

He had to shout at the top of his lungs to get his wife to notice him when she was in the garden.

Correct answer: (d) lungs

Your answer was: incorrect
He had to shout at the top of his mouth to get his wife to notice him when she was in the garden.
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what is lungs mean?

Riot

[Linda]

"The Lungs are the organs that help us to breathe."
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[Kati Svaby]

Hello,

You shout at the top of your lungs when you have to shout as loudly as you possible can.
Kati Svaby