Select the two main parts of the immune system. Involuntary

## Step 1<br />The immune system is a complex network of cells, tissues, and organs that work together to defend the body against harmful invaders such as bacteria, viruses, and other pathogens. It is divided into two main parts: the innate immune system and the adaptive immune system.<br /><br />## Step 2<br />The innate immune system is the body's first line of defense. It includes physical barriers such as the skin and mucous membranes, as well as immune cells like neutrophils and macrophages. These components work together to prevent the entry of pathogens into the body and to eliminate them if they do enter.<br /><br />## Step 3<br />The adaptive immune system, on the other hand, is more specialized and targeted. It involves lymphocytes, which include B cells and T cells. These cells can recognize specific pathogens and mount a targeted attack against them. The adaptive immune system also has a memory component, which allows it to respond more quickly and effectively to pathogens it has encountered before.<br /><br />## Step 4<br />The term "involuntary" is not directly related to the components of the immune system. It generally refers to actions or processes that are not under conscious control, such as the beating of the heart or the reflexive withdrawal of the hand from a hot surface.