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

Question

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.

Answer 1

The correct response is: They are small because they lack a nucleus.

Red blood cells (erythrocytes) are biconcave in shape and lack a nucleus, which allows them to be smaller and more flexible. This flexibility enables them to squeeze through narrow capillaries and effectively transport oxygen throughout the body.