i guess because citrate or anything citric evaporates after in an open area.
Lymphocytes are amassed in the lymph hubs. The spleen and the thymus are additionally lymphoid organs of the resistant framework. The tonsils are lymphoid organs that are additionally connected with the stomach related framework. Lymphoid tissues contain lymphocytes, and furthermore, contain different sorts of cells for support. The confusion is legitimately coordinated with the lymphatic organ dependable is Spleen; failure to expel pathogens from lymph
Answer:
B) Valves closing
Explanation:
A healthy heart makes a lub-dub sound with each beat. This sound comes from the valves shutting on the blood inside the heart. The first sound (the lub) happens when the mitral and tricuspid valves close.
