CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
Question

Which of the following is/are incorrect?


A

Skin is a tough outer layer, so it prevents entry of bacteria and viruses.

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

Skin secretes oil and sweat which are basic and kills most of the microbes.

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

Skin secretes lysozyme along with sweat which prevents infection.

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D

Some bacteria in the stomach release acids which inhibit the growth of pathogens.

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct options are
C

Skin secretes lysozyme along with sweat which prevents infection.


D

Some bacteria in the stomach release acids which inhibit the growth of pathogens.


Innate defence mechanism involves external and internal defence barriers. The external defense line includes the role of physical barriers like skin, mucus and chemical barriers such as sweat, oil and acidic internal secretions like HCl in the stomach.

1. Skin is made of keratinised outer epidermal cells that do not allow the entry of pathogens. Oil and sweat are basic secretions of the glands on skin which mainly inhibit the growth of the pathogens.

2. Mucus is secreted and produced by the epithelial layer in the mucous membrane lining the nasal passage. Mucus is sticky and traps incoming pathogens and also destroys them by secreting an enzyme called lysozyme.

3. Hydrochloric acid or HCl is an acidic gastric juice secreted in the stomach, which also has germicidal properties.


flag
Suggest Corrections
thumbs-up
0
mid-banner-image
mid-banner-image
similar_icon
Related Videos
thumbnail
lock
Immunity - Basics
BIOLOGY
Watch in App