Question at position 8 Which of the following delivers oxygen to tissue cells?neutrophilsplateletserythrocytesmonocytes单项选择题
A
neutrophils
B
platelets
C
erythrocytes
D
monocytes

Question

Question at position 8 Which of the following delivers oxygen to tissue cells?neutrophilsplateletserythrocytesmonocytes

BlackTom AI · Accepted Answer

Erythrocytes carry oxygen because they contain hemoglobin, a protein that reversibly binds O2 in the lungs and releases it in peripheral tissues.

1. Relevant knowledge points and concepts
- Erythrocytes (red blood cells, RBCs) are specialized for gas transport: they are biconcave, anucleate cells packed with hemoglobin.
- Hemoglobin binds oxygen in the pulmonary capillaries to form oxyhemoglobin and releases it where partial pressure of O2 is lower (tissues).
- Neutrophils and monocytes are white blood cells (leukocytes) involved in immune defense; platelets (thrombocytes) mediate blood clotting.

2. Step-by-step reasoning
- Identify which blood element has the capacity to bind and transport oxygen: hemoglobin-bearing cells.
- Only erythrocytes contain large amounts of hemoglobin.
- In the lungs: O2 + Hb -> HbO2 (loading). In tissues: lower PO2 and other factors (CO2, H+, temperature) shift equilibrium to release O2 (unloading).
- Therefore the cell type delivering O2 to tissue cells is the erythrocyte.

3. Intermediate steps (conceptual)
- RBC structure → high surface area/volume ratio and flexibility → efficient gas exchange across capillary endothelium.
- Hemoglobin concentration in RBCs (about 34% by weight) provides the capacity to transport ~1.34 mL O2/g Hb; with typical hemoglobin levels, RBCs transport the vast majority of O2 in blood.

4. Why the correct answer is correct
- Erythrocytes are the only option with abundant hemoglobin and structural adaptations for oxygen transport; they physically deliver O2 to tissue cells by traveling through capillaries and releasing bound oxygen.

5. Why other options are incorrect
- Neutrophils: phagocytic immune cells, not O2 carriers.
- Platelets: cell fragments for clot formation, no hemoglobin.
- Monocytes: precursor immune cells (macrophages), involved in phagocytosis and antigen presentation, not O2 transport.

6. Conclusion
The correct answer is erythrocytes, which matches the provided answer.

Question at position 8 Which of the following delivers oxygen to tissue cells?neutrophilsplateletserythrocytesmonocytes单项选择题

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