What is the process by which a cell engulfs large particles as defense or for food

Phagocytosis .

Explanation:

Phagocytosis is the process by which a cell engulfs large particle as defense or food.

In the process of phagocytosis  the cell extends its plasma membrane traps the particle or antigen  into a phagosome.

Inside the phagosome several lytic enzyme act on the particle and thus digests it.

Macrophages in our body are good exmples of phagocytic cells .

Unicellular organism like Amoeba also carries phagocytosis for food.

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.