The correct answer is: They are flexible because they lack a plasma membrane.
Red blood cells, also known as erythrocytes, are able to move through narrow vessels due to their unique structure. They are small and flexible, allowing them to squeeze through narrow capillaries and navigate through the circulatory system. Unlike other cells, red blood cells do not have a nucleus or other membrane-bound organelles, which further contributes to their ability to traverse through narrow conditions.
How are red blood cells able to move through narrow vessels to carry oxygen throughout a multicellular organism?
They are small because their organelles are smaller than those of other cells.
They are flexible because they lack a plasma membrane.
They are small because they lack a nucleus.
They are long and thin with a tail-like end.
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