Chapter 2, Problem 52FB

Summary Introduction

To review:

The given blank space in the statement, “______________ are phagocytic cells that engulf and digest foreign cells”.

Introduction:

The human body has developed mechanisms to defend the attack from microorganisms. They can control and cope up with the attack. The body shows three lines of defense: physical barriers, defensive cells and proteins, and the immune system. Example of a physical barrier is human skin.