Except for the skin,other physical barriers t | vedclass

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(D) Physical barriers are the first line of defense in the human body.$1.$ The skin is the primary physical barrier that prevents the entry of microor

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$I, II,$ and $III$

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(D) Physical barriers are the first line of defense in the human body.$1.$ The skin is the primary physical barrier that prevents the entry of microorganisms.$2.$ Additionally,the mucus coating of the epithelium lining the respiratory,gastrointestinal,and urogenital tracts acts as a physical barrier.$3.$ This mucus layer traps microorganisms entering the body,thereby preventing them from causing infections.Therefore,all three mentioned tracts ($I, II,$ and $III$) serve as physical barriers.

List-$I$	List-$II$
$(a)$ $IgG$	$(i)$ Protection of body surfaces
$(b)$ $IgA$	$(ii)$ Regulation of allergic reactions
$(c)$ $IgM$	$(iii)$ Activates $B$-cells
$(d)$ $IgD$	$(iv)$ Protection of body fluids
$(e)$ $IgE$	$(v)$ Protection of blood circulation

Except for the skin,other physical barriers that also help to prevent the entry of microorganisms are:
$I.$ Mucus coating of the epithelium lining the respiratory tract
$II.$ Gastrointestinal tract
$III.$ Urogenital tract
Choose the correct option.

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Except for the skin,other physical barriers that also help to prevent the entry of microorganisms are:$I.$ Mucus coating of the epithelium lining the respiratory tract$II.$ Gastrointestinal tract$III.$ Urogenital tractChoose the correct option.