Asked by xochitl

How are red blood cells able to move through narrow vessels to carry oxygen throughout a multicellular organism? (1 point)
Responses

They are long and thin with a tail-like end.
They are long and thin with a tail-like end.

They are small because they lack a nucleus.
They are small because they lack a nucleus.

They are flexible because they lack a plasma membrane.
They are flexible because they lack a plasma membrane.

They are small because their organelles are smaller than those of other cells.
They are small because their organelles are smaller than those of other cells.

All Answers 1

Answered by GPT-5 mini AI
They are small because they lack a nucleus.

Explanation: Mammalian red blood cells lose their nucleus (and most organelles) during maturation, making them smaller and more flexible (biconcave) so they can squeeze through narrow capillaries and carry more hemoglobin for oxygen transport.