All of the following are true of RBCs except a. biconcave disc shape, b. life span of approximately 120 days, c. contain hemoglobin, d. contain nuclei.

Verified step by step guidance

1. Step 1: Understand the structure and function of red blood cells (RBCs). RBCs are known for their unique biconcave disc shape, which increases their surface area for gas exchange.
2. Step 2: Recall the lifespan of RBCs. Typically, RBCs have a lifespan of about 120 days in the bloodstream before they are broken down and recycled.
3. Step 3: Recognize the primary component of RBCs. Hemoglobin is the protein in RBCs responsible for carrying oxygen from the lungs to the rest of the body and returning carbon dioxide from the body to the lungs.
4. Step 4: Consider the cellular components of RBCs. Unlike most cells, mature RBCs do not contain nuclei. This absence allows more room for hemoglobin and contributes to their biconcave shape.
5. Step 5: Identify the statement that is not true about RBCs. Based on the above information, determine which option does not accurately describe RBCs.

Key Concepts

Red Blood Cell Structure

Red blood cells (RBCs) are characterized by their biconcave disc shape, which increases surface area for gas exchange and allows flexibility to navigate through capillaries. This unique shape is crucial for their primary function of transporting oxygen and carbon dioxide throughout the body.

Lifespan of Red Blood Cells

The average lifespan of red blood cells is approximately 120 days. After this period, they are typically removed from circulation by the spleen and liver, where they are broken down and recycled. Understanding this lifespan is important for comprehending blood health and the body's ability to produce new RBCs.

Nucleus in Red Blood Cells

Mature red blood cells in humans do not contain nuclei, which is a key distinguishing feature. During their development in the bone marrow, RBCs expel their nuclei to maximize space for hemoglobin, the protein responsible for oxygen transport. This absence of a nucleus is essential for their primary function but also limits their ability to repair themselves.