CD4 receptors are present on:

Explanation

CD4 receptors are primarily present on the surface of CD4+ T lymphocytes (helper T cells), which play a central role in coordinating the immune response. These receptors are also found on monocytes, macrophages, and dendritic cells, which are important immune cells involved in antigen presentation and immune regulation. The CD4 receptor serves as the primary attachment site for HIV, allowing the virus to recognize, bind, and enter host cells. By interacting with CD4 and a co-receptor (CCR5 or CXCR4), HIV gains access to the host cell's machinery for replication. The presence of CD4 receptors on these immune cells explains why HIV selectively targets them, leading to a progressive decline in immune function and the development of AIDS.