#respiratory

ZOOLOGY

Which respiratory disorder is caused by exposure to dust particles in industries such as stone grinding?

Silicosis is an occupational respiratory disorder caused by long-term exposure to fine dust particles, leading to lung fibrosis. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, ph

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ZOOLOGY

Which respiratory disorder is caused by chronic exposure to pollutants and results in inflammation of the bronchi?

Bronchitis is a respiratory disorder characterized by inflammation of the bronchi due to prolonged exposure to pollutants. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.

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ZOOLOGY

What is the role of the intercostal muscles in respiration?

During inspiration, the external intercostal muscles contract, lifting the ribs and increasing thoracic volume, facilitating air intake. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, ph

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ZOOLOGY

What is the function of surfactant in the alveoli?

Surfactant is a lipoprotein that reduces surface tension in the alveoli, preventing their collapse during exhalation. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.

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ZOOLOGY

Which of the following statements about pulmonary ventilation is incorrect?

Normal expiration is a passive process that occurs due to the relaxation of respiratory muscles, not an active one. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Structural Organisation in Animals and Frog, Topic: Tissues, skeletal and organ systems.

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