Breathing and Exchange of Gases Chapter-Wise Test 5

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about oxygen transport is correct?

Oxygen is mainly transported as bicarbonate ions
Oxygen is primarily transported bound to hemoglobin
Most oxygen is dissolved in plasma
Oxygen is actively transported by RBCs
2

About 97% of oxygen is transported in the blood by binding to hemoglobin in RBCs.

Which of the following conditions leads to difficulty in breathing due to inflammation of bronchi and bronchioles?

Silicosis
Emphysema
Asthma
Pneumonia
3

Asthma is a respiratory disorder caused by inflammation of the bronchi and bronchioles, leading to difficulty in breathing.

What is the role of the intercostal muscles in respiration?

Facilitate gas exchange
Increase thoracic volume during inspiration
Secrete mucus in the bronchi
Reduce lung friction
2

During inspiration, the external intercostal muscles contract, lifting the ribs and increasing thoracic volume, facilitating air intake.

Which of the following is a feature of pulmonary circulation?

Oxygen-rich blood is carried from lungs to the heart
Oxygen-poor blood is transported from lungs to tissues
Carbon dioxide is transported from the lungs to the heart
Pulmonary arteries carry oxygenated blood
1

In pulmonary circulation, oxygen-rich blood is transported from the lungs to the heart via pulmonary veins.

Which respiratory volume refers to the amount of air inspired or expired during normal breathing?

Vital capacity
Inspiratory reserve volume
Tidal volume
Residual volume
3

Tidal volume is the volume of air inspired or expired during a normal respiratory cycle, approximately 500 mL.

Which lung volume represents the total amount of air remaining in the lungs after a normal expiration?

Tidal Volume
Inspiratory Capacity
Expiratory Reserve Volume
Functional Residual Capacity
4

Functional Residual Capacity (FRC) is the volume of air remaining in the lungs after a normal expiration (ERV + RV).

Which part of the brain contains the chemosensitive area that regulates respiration?

Cerebrum
Cerebellum
Medulla oblongata
Hypothalamus
3

The medulla oblongata contains the chemosensitive area responsible for regulating respiration in response to CO₂ and H⁺ levels.

Which form of respiration occurs in aquatic arthropods and mollusks?

Tracheal respiration
Cutaneous respiration
Branchial respiration
Pulmonary respiration
3

Aquatic arthropods and mollusks use branchial respiration, where gaseous exchange occurs through gills.

Which factor decreases the affinity of hemoglobin for oxygen?

Increase in pO2
Decrease in pCO2
Increase in temperature
Decrease in H+ concentration
3

Increased temperature decreases the affinity of hemoglobin for oxygen, promoting oxygen release at tissues.

Which of the following occurs in hypoxia?

Increased oxygen supply to tissues
Reduced oxygen availability in tissues
Excessive carbon dioxide in blood
Hyperventilation
2

Hypoxia is a condition where oxygen supply to tissues is reduced, affecting cellular respiration.

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