AP BIOLOGY

Detailed explanation-1: -White blood cells are a part of your immune system that protects your body from infection. These cells circulate through your bloodstream and tissues to respond to injury or illness by attacking any unknown organisms that enter your body.

Detailed explanation-2: -White blood cells are immune system cells. They are like warriors waiting in your blood stream to attack invaders such as bacteria and viruses. When fighting an infection, your body produces more white blood cells.

Detailed explanation-3: -So, the correct option is ‘To defend the body against infections’

Detailed explanation-4: -White blood cells are part of the body’s immune system. They help the body fight infection and other diseases. Types of white blood cells are granulocytes (neutrophils, eosinophils, and basophils), monocytes, and lymphocytes (T cells and B cells).

Detailed explanation-5: -These are involved in fighting against infections in the body. With the ability of amoeboid movement, white blood cells can change their shape. This property allows these cells to enter into intercellular spaces by squeezing through the walls of the blood vessel and reaching the site of infection.