What is the life span of a normal mature human Red Blood Cell (Erythrocyte) in the circulation?
Answer and explanation
Correct answer: C. Approximately 120 days
- Step 1: Mature red blood cells lack nuclei and organelles, preventing cellular repair and protein synthesis. Step 2. After circulating for approximately 120 days, aging senescent erythrocytes are phagocytosed by macrophages in the spleen and liver. Answer: Approximately 120 days. Why not the others: 10 days is the life span of blood platelets (thrombocytes); 30 days is intermediate; 365 days is far longer than RBC survival.
Practise more Human Physiology and Animal Diversity.
Free questions with an explanation for every one, and full timed Medical College Admission Test (Bangladesh) mock tests.
More Human Physiology and Animal Diversity questions
- Which specialized cardiac tissue serves as the primary natural pacemaker of the human heart?
- What is the normal resting blood pressure of a healthy human adult measured in millimeters of mercury (mmHg)?
- What is the primary form in which carbon dioxide is transported from body tissues to the lungs in human blood? (Hard)
- What is the Hamburger phenomenon (Chloride Shift) during carbon dioxide transport in blood? (Hard)
- Which enzyme secreted by the chief cells of the gastric mucosa initiates protein digestion in the human stomach?
- Where is bile synthesized, and where is it stored and concentrated before release into the duodenum?