What are the lymphocytes that secrete chemicals and kill harmful cells called?

Question

Quizplus · Accepted Answer

T-cells, also known as T-lymphocytes, are lymphocytes that secrete chemicals and kill harmful cells such as virus-infected cells or cancer cells. Antibodies (B) are proteins produced by B-cells (C) that are used to tag and destroy foreign substances, but they do not directly kill cells. Thrombocytes (D) are platelets involved in blood clotting, but they are not related to the immune system response.

What Are the Lymphocytes That Secrete Chemicals and Kill Harmful