Which of the following is the first barrier of defence in our body?

Skin

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Mucus

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Hydrochloric acid

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Ear wax

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Solution

The correct options are
A
Skin

B
Mucus

D
Ear wax

A protein called keratin makes the skin a thick fort which prevents germs from entering it. Mucus in the trachea prevents the entry of germs into the lungs. The wax in the ear prevents pathogens. Hydrochloric acid in the stomach also fights against germs but since this is inside the body, it is not considered as the first barrier of defence.

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Q. Physiological barriers include:

1. Acid of the stomach
2. Skin
3. Saliva
4. Mucus membranes
5. Tears

How many of the above are examples of physiological barriers?

Question 6
The inner lining of the stomach is protected by one of the following from hydrochloric acid. Choose the correct one.

(a) Pepsin
(b) Mucus
(c) Salivary amylase
(d) Bile

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Q. What is the role of hydrochloric acid in our stomach?

Q. Assertion :Skin is a physical barrier and acts as component of first line of defence. Reason: Sebum and sweat of skin have acidic pH, making the skin to initiate effective microbial growth.

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