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Mammalian RBC doesn't utilize the receiv...

Mammalian RBC doesn't utilize the received oxygen and completely transfer it to tissue cells because of

A

Biconcave shape

B

Enucleate

C

absence of mitochondria

D

absence of haemoglobin

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### Step-by-Step Solution: 1. **Understanding the Function of RBCs**: - Red Blood Cells (RBCs), also known as erythrocytes, primarily function to transport gases such as oxygen (O2) and carbon dioxide (CO2) throughout the body. 2. **Analyzing the Options**: - The question asks why mammalian RBCs do not utilize the oxygen they carry and instead transfer it completely to tissue cells. The options provided are: - A) Biconcave shape - B) Enucleated - C) Absence of mitochondria - D) Absence of hemoglobin 3. **Evaluating Each Option**: - **Option A: Biconcave Shape**: - The biconcave shape of RBCs facilitates their movement through narrow blood vessels and increases their surface area for gas exchange. However, this shape does not influence the utilization of oxygen. Thus, this option is incorrect. - **Option B: Enucleated**: - RBCs lack a nucleus and other organelles like mitochondria. The absence of a nucleus allows more space for hemoglobin, which is essential for oxygen transport. However, this does not directly relate to the utilization of oxygen. Therefore, this option is also incorrect. - **Option C: Absence of Mitochondria**: - Mitochondria are the sites of aerobic respiration where oxygen is utilized to produce energy (ATP). Since mammalian RBCs do not have mitochondria, they cannot perform aerobic respiration, meaning they cannot utilize the oxygen they transport. Instead, they deliver it to the tissues. This option is correct. - **Option D: Absence of Hemoglobin**: - Hemoglobin is crucial for binding and transporting oxygen. RBCs are rich in hemoglobin, which allows them to carry oxygen effectively. Thus, this option is incorrect. 4. **Conclusion**: - The correct answer is **C) Absence of mitochondria**. This absence prevents RBCs from utilizing the oxygen they transport, leading to its complete transfer to tissue cells.
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