Identify the cell in the image

I am a cell that needs cell-to-cell contact signals from APCs for activation. Who am I?

I can produce thousands of antibodies per second. Who am I?

I do not directly kill other cells but I wake up and breathe life into other cells. Who am I?

We are the most populated cells in the blood. We give colour to the blood. Who are we?

I am very specific in the attack. I need a unique shape for recognition and action.

The organ where lymphocytes interact with antigens is

I am the organ where T cells are originated. Who am I?

I am the mother cell of the dendritic cell. Who am I?