RESPIRASI 15 OKT 2025

Which statement is true about oxygen transport?

• Most O₂ is dissolved in plasma.

• O₂ binds to the globin portion of hemoglobin

• Oxyhemoglobin (HbO₂) is the major form of O₂ transport.

• Hemoglobin has higher affinity for O₂ in tissues than in lungs.

Most of the carbon dioxide in the blood is transported as:

• Dissolved CO₂

• Carbaminohemoglobin (HbCO₂)

• Bicarbonate ion (HCO₃⁻)
  

• Carbonic acid (H₂CO₃)

Surfactant is mainly composed of:

• A. Cholesterol and bile salts

• B. Proteins and phospholipids (especially dipalmitoylphosphatidylcholine)

• C. Triglycerides and sphingolipids

• D. Glycoproteins only

Which of the following best describes the Bohr Effect?

• A. CO₂ and H⁺ decrease Hb’s affinity for O₂, promoting O₂ release to tissues

• B. O₂ binding to Hb enhances CO₂ transport

• C. CO₂ increases O₂ binding in the lungs

• D. O₂ and CO₂ bind to the same site on hemoglobin

Which factor shifts the oxygen–hemoglobin dissociation curve to the right?
A. ↓ CO₂, ↓ temperature, ↑ pH
B. ↑ 2,3-BPG, ↑ CO₂, ↑ temperature
C. ↓ 2,3-BPG, ↓ CO₂, ↓ temperature
D. ↑ pH, ↓ CO₂, ↓ temperature

• A. ↓ CO₂, ↓ temperature, ↑ pH

• B. ↑ 2,3-BPG, ↑ CO₂, ↑ temperature

• C. ↓ 2,3-BPG, ↓ CO₂, ↓ temperature
  

• 
  D. ↑ pH, ↓ CO₂, ↓ temperature