Chapter 43, Problem 5IQ

Summary Introduction

To label: The components in the following diagram that shows a helper T cell is activated by interaction with an antigen-presenting cell and the helper T cell's central role in activating both humoral and cell-mediated immunities.

Introduction: The immune system plays an important role in the human body. It protects the body from the invading organisms. The immune system is classified into two types namely the innate immune system and adaptive immune system. The innate immune system starts its action from the time of birth whereas the adaptive immune system starts its action in the later stages of life when exposed to antigens for the first time. The adaptive immune system is divided into two types namely humoral immunity and cell-mediated immunity.