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How is most oxygen transported in the blood?

A.

Dissolved in plasma

B.

By hemoglobin

C.

By bicarbonate

D.

By pulmonary surfactants

Answer and Explanation

The Correct Answer is B

A. Dissolved in plasma- only ~1.5% of oxygen is dissolved in plasma.

B. By hemoglobin- ~98.5% of oxygen binds to hemoglobin in red blood cells.

C. By bicarbonate- this primarily transports carbon dioxide, not oxygen.

D. By pulmonary surfactants- surfactant reduces surface tension in alveoli, not related to oxygen transport in blood.


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Related Questions

Correct Answer is C

Explanation

A. Surrounded by rings of cartilage: Only the larger bronchi are surrounded by cartilage; bronchioles and alveoli are not.

B. Upper respiratory structures: These are part of the lower respiratory tract.

C. Collectively referred to as the bronchial tree: This is the correct term for the branching airway system from the trachea to alveoli.

D. The sites of the exchange of respiratory gases: Only the alveoli are directly involved in gas exchange.

Correct Answer is B

Explanation

A. Due to contraction of the trapezius muscle: Not involved in normal breathing.

B. Referred to as ventilation (breathing): Correct; ventilation is the process of moving air in and out of the lungs.

C. Due to relaxation of the diaphragm and intercostal muscles: Only exhalation is passive due to relaxation.

D. Caused by contraction and relaxation of the bronchiolar smooth muscle: Regulates airflow, not breathing movements.

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