Diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system. Why?

Why the blood of cockroach is not responsible for transporting respiratory gases?

Gases diffuse over the respiratory surface because of

Why the limbic system is called the emotional brain ? Name the parts of it.

Why do noble gases form compounds with fluorine and oxygen only?

Direction : In each of the following questions , a statement of Assertion is given and a corresponding statement of Reason is given just below it .Of the four statements ,given below,mark one as the correct answer . Assertion: Diffusion of molecules occures through a semipermeable membrane . Reason : Molecules of gases are only involved in diffusion.

Respiratory system of cockroach is formed of spiracles and tracheal interconnections. Why is it said to be more efficient than that of earthworm? Why inspiration of cockroach is said to be a passive process while it is an active process in man?