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

Question

Responses

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.

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

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

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

Answer 1

The correct response is:

They are small because they lack a nucleus.

Red blood cells (RBCs) are flexible and biconcave in shape, which helps them navigate through narrow capillaries while efficiently carrying oxygen. Their lack of a nucleus and other organelles allows for more space to accommodate hemoglobin, the protein that binds oxygen, and facilitates their ability to deform and pass through tight spaces.