MCQ
$A =$ Gas exchange continues non stop in the lungs even during exhalation.
$R =$ Lungs have residual air
- A$A$ is true and $R$ is false
- B$A$ is false and $R$ is true
- ✓Both $A$ and $R$ are true
- DBoth $A$ and $R$ are false
$R =$ Lungs have residual air
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($i$) It consists of a network of trachea, that open through $12$ pairs of small holes called spiracles present on the lateral side of the body.
($ii$) Thin branching tubes carry oxygen from the air to all the parts.
($iii$) The opening of the spiracles is regulated by sphincters.
($iv$) Exchange of gases take place at the tracheoles by diffusion.