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

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

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.

Answer 1

They are small because they lack a nucleus.

Answer 2

is that right

Answer 3

Yes, that is correct. Red blood cells (erythrocytes) are able to move through narrow blood vessels primarily because they are small and lack a nucleus. This unique characteristic allows them to take on a biconcave shape, which increases their surface area for gas exchange and enables them to be flexible enough to squeeze through narrow capillaries. Their lack of a nucleus and other organelles also allows more space for hemoglobin, the protein that carries oxygen.