What is the function of white blood cells?
A. Carry oxygen
B. Produce enzymes
C. Protect the body from disease
D. Regulate body temperature
Answer (1)
The correct answer is C. Protect the body from disease White blood cells (WBCs), also known as leukocytes, are essential components of the immune system. Their primary function is to defend the body against infectious organisms such as bacteria, viruses, fungi, and parasites. They also play a role in destroying abnormal or cancerous cells and in responding to allergens.There are several types of white blood cells, each with specialized roles:Neutrophils - First responders to bacterial infection; they engulf and digest invaders.Lymphocytes - Include B cells (which produce antibodies) and T cells (which attack infected or abnormal cells).Monocytes - Become macrophages that clean up dead cells and debris.Eosinophils and basophils - Respond to allergens and parasitic infections.Unlike red blood cells, white blood cells have nuclei and can live for several days or even years, depending on their type. They travel through the bloodstream and the lymphatic system, patrolling the body for signs of danger.When a pathogen enters the body, the immune system is activated. White blood cells work to identify, isolate, and eliminate the threat. For example, in bacterial infections, neutrophils rush to the site of infection and engulf the bacteria in a process called phagocytosis.A low white blood cell count (called leukopenia) can make a person more susceptible to illness. On the other hand, high levels can indicate infection or immune system disorders.
