Question

Which cell is not present in connective tissue proper?

• A. Erythrocytes
• B. Lymphocytes
• C. Plasma cell
• D. Fibroblast

Answer 1

Answer: (A)

Erythrocytes

Answer 2

Connective tissue proper includes tissues like loose connective tissue (e.g., areolar, adipose) and dense connective tissue (e.g., dense regular, dense irregular, elastic).

• Fibroblasts are the most abundant cells in connective tissue proper, responsible for synthesizing fibers and ground substance.
• Lymphocytes are immune cells that can migrate into connective tissue proper, especially during immune responses.
• Plasma cells are differentiated B lymphocytes that produce antibodies and are found in connective tissue, particularly in areas of inflammation.
• Erythrocytes (red blood cells) are primarily confined within blood vessels and are responsible for oxygen transport. While blood is a specialized connective tissue, erythrocytes are not resident cells of connective tissue proper. Their presence outside blood vessels in connective tissue proper usually indicates bleeding (hemorrhage).

Therefore, erythrocytes are not typically found as resident cells in connective tissue proper.