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What colour will oxygen poor blood be?

What is the composition of plasma?

How is the composition of plasma kept relatively constant?

What are the plasma proteins and what are their functions?

Why do erythrocytes differ from other blood cells?

What makes erythrocytes efficient blood transporters?

Approximately how many hemoglobin molecules are in a red blood cell?

How much hemoglobin is in the blood?

What is anemia?

What can cause anemia?