What type of blood cell is biconcave and lacks a nucleus when they are mature?Multiple ChoicePlateletsMacrophagesWhite blood cellsRed blood cells
Question
What type of blood cell is biconcave and lacks a nucleus when they are mature?
Multiple Choice
- Platelets
- Macrophages
- White blood cells
- Red blood cells
Solution
The type of blood cell that is biconcave and lacks a nucleus when mature is:
Red blood cells.
Explanation
- Platelets: These are cell fragments involved in clotting, but they do not have a biconcave shape and are not true cells.
- Macrophages: These are a type of white blood cell that have a nucleus; they are part of the immune system.
- White blood cells: These have various shapes and functions but they all have nuclei.
- Red blood cells: They are biconcave in shape, maximally efficient for gas exchange, and lack a nucleus when they are mature.
Thus, the correct answer is Red blood cells.
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