___________ leave the blood and enter tissues to fight off pathogens and invaders. a. Platelets b. Capillaries c. Red blood cells d. White blood cells
The white blood cells are the ones who leave the blood and enter tissues to fight off pathogens and invaders. The answer is letter D. They are not platelets because platelets help the healing of wounds and prevent it from bleeding by forming blood clots on the wounded area. They are not red blood cells because they carry oxygen all throughout the body organs. And they are not capillaries because capillaries are the ones that transports the oxygenated blood into the arteries.