Breathing And Exchange Of Gases Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which part of the respiratory system is commonly called the "voice box"?

Trachea
Larynx
Pharynx
Bronchi
2

The larynx is known as the voice box because it contains the vocal cords responsible for sound production.

Which of the following statements about lung function is correct?

Lung expansion is caused by contraction of the pleura.
Air moves into the lungs when intrapulmonary pressure is lower than atmospheric pressure.
Gas exchange occurs primarily in the bronchi.
Expiration is caused by contraction of the diaphragm.
2

Inhalation occurs when intrapulmonary pressure falls below atmospheric pressure, allowing air to flow into the lungs.

Which of the following correctly represents the partial pressure of oxygen (pO₂) in the alveoli?

159 mmHg
95 mmHg
40 mmHg
104 mmHg
4

The partial pressure of oxygen (pO₂) in the alveoli is approximately 104 mmHg, facilitating its diffusion into the blood.

What is the function of surfactant in the alveoli?

Facilitates oxygen transport
Reduces surface tension
Enhances carbon dioxide transport
Stimulates respiratory muscles
2

Surfactant is a lipoprotein that reduces surface tension in the alveoli, preventing their collapse during exhalation.

Which parameter is used to assess lung function in a clinical setting?

Body Mass Index
Spirometry
Blood pressure monitoring
Electrocardiogram
2

Spirometry is a clinical tool used to assess lung function by measuring various respiratory volumes.

Which of the following statements about hemoglobin and oxygen transport is correct?

Hemoglobin binds oxygen irreversibly.
Oxygen dissociation from hemoglobin is influenced by pH and pCO₂ levels.
Oxygen transport is unaffected by temperature changes.
Oxygen binds to hemoglobin in tissues and is released in the lungs.
2

Oxygen dissociation from hemoglobin is influenced by factors such as pH, pCO₂ levels, and temperature, known as the **Bohr effect**.

What type of respiration is used by amphibians like frogs in addition to pulmonary respiration?

Tracheal respiration
Cutaneous respiration
Branchial respiration
Anaerobic respiration
2

Amphibians like frogs use cutaneous respiration, where gas exchange occurs through their moist skin in addition to lungs.

Which part of the respiratory system is the common passage for food and air?

Larynx
Trachea
Pharynx
Bronchi
3

The pharynx serves as a common passage for both air (to the lungs) and food (to the esophagus).

Which of the following animals use tracheal tubes for respiration?

Earthworms
Frogs
Insects
Fishes
3

Insects use a network of tracheal tubes to transport atmospheric air within their body for respiration.

Which lung capacity includes Tidal Volume and Inspiratory Reserve Volume?

Vital Capacity
Expiratory Capacity
Inspiratory Capacity
Functional Residual Capacity
3

Inspiratory Capacity (IC) includes Tidal Volume (TV) and Inspiratory Reserve Volume (IRV), representing the maximum volume of air a person can inspire after a normal expiration.

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