Let's evaluate the statements regarding entities involved with the body’s immunity:
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Stem cells are cells that differentiate into specialized cells and can be harvested from the bone marrow.
- This statement is true. Hematopoietic stem cells found in the bone marrow can differentiate into various blood cells, including those involved in the immune response.
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B cells are lymphocytes that make antibodies that remember various antigens, thereby maintaining immunity against previously encountered pathogens.
- This statement is also true. B cells are a type of lymphocyte responsible for producing antibodies, which help recognize and remember specific antigens from previous infections. This memory contributes to long-term immunity.
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Osteocytes are branched cells embedded in the matrix of bone tissue.
- This statement is true, but it is not specifically related to immunity. Osteocytes are indeed derived from osteoblasts and are involved in bone maintenance, but they do not play a direct role in the immune system.
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Erythrocytes are red blood cells that contain the pigment hemoglobin, which imparts the red color to blood.
- This statement is true as well, but like osteocytes, erythrocytes are not directly involved in immunity. Their primary role is to transport oxygen and carbon dioxide in the blood.
Conclusion: The statements about stem cells and B cells are directly related to immunity, while the statements about osteocytes and erythrocytes, although true, do not pertain to immune function. Therefore, the true statements about immunity are the first two: stem cells (related to differentiation into immune cells) and B cells (involved in adaptive immunity).
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