Chapter 20, Problem 1VC

(a)

Summary Introduction

To determine:

Whether the change on the wall of the vessel will help the organism to spread to other locations.

Concept introduction:

White blood cells or leukocytes are formed as same as RBCs by a process called erythropoiesis. White blood cells are agranulocytes or granulocytes and lack hemoglobin. They are defensive cells which provide protection against the pathogen.

(b)

Summary Introduction

To explain:

The progress of the disease in the case when organisms are able to survive phagocytosis.

Concept introduction:

White blood cells or Leucocytes have no pigment so; it is called White blood cells. It has property to defend the body against invading pathogens. They engulf the pathogens by phagocytosis and export them out of the body.