Question

lo 2.5. what is the role of neutrophils in the immune system?
they are responsible for producing antibodies.
they are involved in breaking down food during digestion.
they regulate the bodys temperature.
they are the first line of defense against bacterial infections.
they help to regulate blood sugar levels.

Explanation:

Neutrophils are a type of white blood cell. They are phagocytes, which means they engulf and destroy pathogens. In the context of the immune system, when bacteria or other foreign invaders enter the body, neutrophils are quickly recruited to the site of infection. They are part of the innate immune system.

• Antibodies are produced by B - lymphocytes, not neutrophils.
• Breaking down food during digestion is the role of digestive enzymes (e.g., amylase, protease) and the digestive system organs (e.g., stomach, intestines), not neutrophils.
• Body temperature regulation is mainly through the hypothalamus (sensing) and mechanisms like sweating (cooling) and shivering (warming), not neutrophils.
• Regulating blood sugar levels is the role of hormones like insulin (produced by the pancreas) and glucagon, not neutrophils.

Answer:

They are the first line of defense against bacterial infections.