Identify the lymph nodes indicated by the arrow in the image below. Fill in the blank

dropdown

A. autoimmune disease: when the immune system targets the body’s own tissues (e.g., Hashimoto thyroiditis), it is classified as an autoimmune disease.
B. tissue rejection reaction: tissue rejection refers to immune attack against a transplanted (non-self) organ, not the person’s own tissue.
C. secondary immune response: a secondary immune response refers to the heightened response on re-exposure to an antigen (memory response), not self-destruction of an organ.
D. type IV hypersensitivity: some autoimmune diseases involve cell-mediated (type IV) mechanisms, but autoimmune disease is the broader correct classification; not all autoimmune thyroid destruction is exclusively type IV.

A. Converts fibrinogen to fibrin: that reaction is carried out by thrombin, not plasmin.
B. Breaks down fibrin, dissolving the clot: plasmin is the primary enzyme of fibrinolysis, cleaving fibrin to dissolve formed clots.
C. Triggers the extrinsic clotting mechanism, leading to clot formation: the extrinsic pathway is initiated by tissue factor (factor III) interacting with factor VII, not plasmin.
D. Inactivates thrombin, slowing clot formation: plasmin’s main role is fibrin breakdown; thrombin is primarily regulated by antithrombin, thrombomodulin–protein C systems. (Plasmin can degrade some clotting proteins but it is not described as the main inactivator of thrombin.)