ANATOMY

Detailed explanation-1: -Your white blood cells are in your bloodstream and travel through blood vessel walls and tissues to locate the site of an infection.

Detailed explanation-2: -White blood cells in the brain “These ‘immune cells’ are not just present in the blood. They are constantly circulating around our body and enter all of our organs, including-as it turns out-the brain.

Detailed explanation-3: -White blood cells can freely pass through the walls of a capillary. Red blood cells travel in single file through the capillaries. These tiny blood vessels finally empty into larger blood vessels, called veins, that take blood back to the heart.

Detailed explanation-4: -Red cells, white cells and platelets are made in the marrow of bones, especially the vertebrae, ribs, hips, skull and sternum.