inaczej erytrocyty, są wytwarzane przez szpik kostny. Mają kształt dwuwklęsłego krążka. Czerwone krwinki zawierają hemoglobinę, która jest odpowiedzialna za transport tlenu z płuc do tkanek. Liczba krwinek w 1ml krwi u mężczyzn wynosi około 5,4 mln, a u kobiet 4,8 mln.
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