1. What specializations are found in tonsils to trap pathogens that might be inhaled or ingested?

2. Lymph enters a lymph node through the Blank 1 lymphatic vessels, flows through the Blank 2 sinus, into the Blank 3 and Blank 4 sinuses, finally leaving the node through the Blank 5 lymphatic vessels.

3. The fluid component of blood is Blank 1, which is filtered out of the capillaries to be Blank 2 fluid in the tissue. When that moves into lymphatic vessels, it is known as Blank 3 fluid.

4. (Correct me if I am wrong) Where are stem cells found that produce lymphocytes? in Central lymphoid organs and thymus.