What is the shape do erythrocytes in human blood?

Oval convex discs
One-sided convex disc
Oval biconcave disks
Sphere
In humans, mature red blood cells are flexible and oval biconcave discs. They lack a cell nucleus and most organelles, in order to accommodate maximum space for hemoglobin; they can be viewed as sacks of hemoglobin, with a plasma membrane as the sack. Approximately 2.4 million new erythrocytes are produced per second in human adults.
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Oval convex discs
One-sided convex disc
Oval biconcave disks
Sphere
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