Concept:Mature mammalian red blood cells (RBCs) lack key organelles to increase oxygen-carrying capacity.
Explanation:RBCs have no nucleus.
This allows more space for hemoglobin, enabling higher oxygen transport.
RBCs also lack mitochondria.
Without mitochondria, RBCs rely on anaerobic respiration, which does not consume the oxygen they carry.
RBCs have no endoplasmic reticulum.
This means no protein synthesis occurs inside the cell.
Each RBC contains about
270 million hemoglobin molecules.
Each hemoglobin molecule has four heme groups that bind oxygen.
These adaptations maximize oxygen delivery throughout the body.
Answer:Option 1: no nucleus, no mitochondria, and no endoplasmic reticulum.