Biology / Unit 13 Bio 3191 short lesson, about 20 seconds
Erythrocyte Structure and Function
Captions available
The idea
Erythrocytes, or red blood cells, are disc-shaped, nucleus-lacking cells packed with hemoglobin, per Bio 3161, their shape maximizing surface area for oxygen-carrying protein.
In practice
Lacking a nucleus leaves a mammalian erythrocyte more internal space for hemoglobin than a nucleated cell allows.
Where people slip
The missing nucleus limits an erythrocyte's lifespan — it cannot repair itself or divide once mature.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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