Vertebrate immune cells, which are phagocytic, include i) neutrophils ii) macrophages iii) dendritic cells iv) natural killer cells

Macrophages

Using the receptors on their surface and through the facilitation by immunoglobulins that attach to the foreign matter, macrophages 'hold' the foreign bodies in the body and 'ingest' them through phagocytosis. Lysozymes in the cells then in 'digest' the foreign matter.

If the experiment was perfomed more then once and you get the same results