Question

Innate immunity is provided by
A. Neutrophils
B. T-cells
C. B-cells
D. Antibody

Answer 1

Hint: Every day we are exposed to a large number of infectious agents. However, only some of the exposures lead to disease, as the body is able to defend itself from most of these foreign agents. This overall ability of the host to fight the disease-causing organisms, provided by, immune system is called immunity.

Complete Answer:
Immunity is of two types:
1. Innate immunity is accomplished by providing different types of barriers to the entry of foreign agents or any pathogen into our body. It is present at the time of birth so also called inborn immunity. This is non-specific of defence innate immunity consists of four types of barriers.
2. Acquired immunity: it is gained after birth and is pathogen specific. When our body encounters the pathogen for the first time, it initiates a response called primary response.

Now let us collect information about given options:
A. Neutrophils: innate immunity is a barrier to the foreign particles. Neutrophils are phagocytic in nature so it gives response to the foreign particles. Thus, this option is correct.
B. T-cells : These cells secrete performs which create pores on the invader's cell membrane for water to enter into it thereby the cell swells up and finally lyses. It provides cell mediated immunity.
C. B-cells: The B-lymphocytes produce an army of proteins in response to the pathogen. As any pathogen enter into the blood, B-lymphocytes get activated and provides humoral immunity
D. Antibody: Antibodies are Immunoglobulins (lg) which are produced in response to antigenic stimulation. Antigens stimulate production of antibodies.

Our required option is A that is Neutrophils.

Note: Neutrophils are the most abundant cells (60-65 percent) of the total WBCS. They are phagocytic in nature. They commonly squeeze between the cells of the capillary walls and wander through the intercellular spaces. From here they move to infected areas of the body They engulf and digest disease causing bacteria.