Question

Which of the following is an atomical barrier?

• A. Fever response
• B. Acidity of stomach
• C. Chemical mediators like lysozyme
• D. Sebaceous glands

Hint:

Atomical barriers = Physical tissue structures and integumentary glands (Skin, Mucosa, Sebaceous glands).
Physiological barriers = Temperature (fever), pH (gastric acid), and chemical enzymes (lysozyme).

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
The question asks to identify which component represents an atomical/physical barrier mechanism involved in inte immunity.

Step 2: Key Formula or Approach:
Inte immunity relies on initial protective barriers classified into distinct categories:
• Atomical Physical Barriers: Skin, mucous membranes, epidermal structures, and associated integumentary glands.

• Physiological Chemical Barriers: Low pH of gastric juice, temperature changes (fever), solubilized enzymes (lysozyme), and antimicrobial peptides.

Step 3: Detailed Explation:

• Sebaceous Glands as Atomical Components: Sebaceous glands are structural exocrine glands embedded within the dermis layer of the skin (a primary atomical barrier). They secrete sebum, an oily substance rich in fatty acids, which forms a hydrophobic lipid layer that coats the skin surface to prevent pathogen invasion and microbial colonization.

• Evaluation of Other Options:
• Fever Response: A systemic physiological response regulated by pyrogens acting on the hypothalamus to elevate body temperature.

• Acidity of Stomach: A physiological/chemical barrier created by hydrochloric acid ($\text{HCl}$) secreted by gastric parietal cells.

• Lysozyme: A soluble chemical mediator/enzyme present in tears and saliva that hydrolyzes peptidoglycan linkages in bacterial cell walls.

Step 4: Fil Answer:
Sebaceous glands, as part of the integumentary system structure, function as an atomical barrier.