2.61 understand how adaptations of red blood cells make them suitable for the transport of oxygen, including shape, the absence of a nucleus and the presence of haemoglobin

Red blood cells: transports oxygen from lungs to respiring cells for Aerobic respiration.

 Red Blood Cell Adaptations:

Hemoglobin:
-RBCs contain hemoglobin to allow the cell to transport oxygen.
-hemoglobin: a red protein responsible for transporting oxygen.

 No nucleus:
-no nucleus to have more hemoglobin, which allows more oxygen to be transported.

Small and flexible:
-allows the RBC to squeeze through narrow blood vessels and capillaries.

Thin cell membrane:
-short diffusion distance, allowing efficient rate of diffusion of oxygen

Biconcave:
-RBCs have a biconcave (flattened disc) shape to increase surface area to volume ratio for efficient rate of diffusion of oxygen.