Question

what important protein do human red blood cells contain?
a hemoglobin
b titin
c antibodies

Explanation:

Human red blood cells (erythrocytes) primarily contain hemoglobin, a protein that binds to oxygen and facilitates its transport throughout the body. Titin is a protein in muscle tissue, and antibodies are produced by white blood cells (lymphocytes), not red blood cells. So the correct option is the one with hemoglobin.

Answer:

a. hemoglobin