Answer:
Macrophages and lymphocytes.
Step-by-step explanation:
Lymphatic system is one of the most important part of the body fluid system that also plays a role in the immunity. The lymph fluid is carried towards the heart.
The lymphatic system contains an aggregates of the lymphocytes and macrophages that plays an important role in immunity. The bacteria and proteins are also present in the lymphatic system.
Thus, the answer is macrophages and lymphocytes.