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

Similar Questions

With regards to the physiology of external respiration, carbon monoxide poisoning is most analogous to:

Hb’s capacity to bind and carry oxygen in the presence of carbon monoxide is [ Select ] decreased increased remains unchanged because CO binds to [ Select ] globin chains (allosteric binding sites) heme (oxygen’s primary binding site) .

Annie Lawrence has a diagnosis of a bleeding duodenal ulcer. Her physician has ordered a transfusion of packed red blood cells. What will this transfusion do for Ms. Lawrence?

Which of the following is the main component of blood responsible for carrying oxygen to the body's tissues?

Question at position 9 How is oxygen transported in the blood?It is dissolved by blood plasma.By platelets.By red blood cells.By white blood cells.Clear my selection

Question at position 26 The bright red, oxygenated hemoglobin travels to the __________ tissues, where it releases some of the oxygen molecules.BrainBodyLungsHeart

More Practical Tools for Students Powered by AI Study Helper

Homework AI Solver

Stylized AI Paper Writer

Plagiarism Checker Assistant

Citation AI Academic Writing Tool

In-Class Translation Assistant

AI Note Generator

AI Quiz Answers

Past Exam Questions from University Test Bank

Smart Practice Assistant

Adaptive Practice

Making Your Study Simpler