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  4. Breathing and Exchange of Gases Chapter-Wise Test 2

Breathing and Exchange of Gases Chapter-Wise Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which part of the respiratory system is lined with cartilaginous rings to prevent collapse?

Alveoli
Bronchioles
Trachea
Larynx
3

The trachea is supported by incomplete cartilaginous rings that prevent its collapse during breathing.

What happens to the alveolar pressure during inspiration?

It increases above atmospheric pressure
It remains unchanged
It decreases below atmospheric pressure
It becomes equal to pleural pressure
3

During inspiration, alveolar pressure decreases below atmospheric pressure, allowing air to enter the lungs.

What happens to the diaphragm during inspiration?

It contracts and moves downward.
It relaxes and moves upward.
It remains stationary.
It thickens and hardens.
1

During inspiration, the diaphragm contracts and moves downward, increasing the thoracic cavity volume.

Which of the following correctly describes the role of the pneumotaxic center?

It prolongs inspiration.
It regulates the duration of inspiration to prevent lung overinflation.
It directly stimulates the diaphragm to contract.
It is located in the medulla oblongata.
2

The pneumotaxic center, located in the pons, regulates the duration of inspiration and prevents excessive lung expansion.

Which of the following is NOT a function of the conducting part of the respiratory system?

Transport of air to alveoli
Filtering of foreign particles
Exchange of gases
Humidification of air
3

The conducting part of the respiratory system transports air, filters it, and humidifies it, but gas exchange occurs only in the alveoli.

Which of the following factors does not influence breathing rate?

Blood CO₂ concentration
Blood O₂ concentration
Blood nitrogen concentration
Blood pH
3

Nitrogen is not involved in the regulation of breathing rate, unlike CO₂, O₂, and blood pH.

Which of the following has the highest solubility in blood?

Oxygen
Nitrogen
Carbon dioxide
Argon
3

Carbon dioxide is 20-25 times more soluble in blood than oxygen, making it easier to transport.

Which part of the respiratory system is responsible for warming and filtering inhaled air?

Alveoli
Trachea
Nasal chamber
Bronchioles
3

The nasal chamber warms, filters, and humidifies inhaled air before it reaches the lungs.

Which lung volume represents the additional amount of air that can be inhaled after a normal inspiration?

Tidal Volume
Inspiratory Reserve Volume
Expiratory Reserve Volume
Residual Volume
2

Inspiratory Reserve Volume (IRV) is the additional amount of air a person can inhale after a normal inspiration.

Which neural center primarily regulates respiratory rhythm?

Cerebrum
Medulla oblongata
Cerebellum
Hypothalamus
2

The respiratory rhythm center in the medulla oblongata controls the basic rhythm of breathing.

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