Chart 1 is a schematic diagram of observing human blood smear with microscope. Please answer according to the chart: (1) When people are infected and inflamed, the number _ _ _ _ in the chart will be significant. (1) When a certain part of the body is inflamed and bacteria invade, some white blood cells can pass through the capillary wall, gather in the injured part and devour the bacteria, so the number of white blood cells will increase; White blood cells will die after swallowing germs, so most white blood cells can only live for a few days.

(2) In the figure, ① is white blood cell ③ is red blood cell. Mature red blood cells have no nucleus, are round and concave around. There are many kinds of white blood cells, with nuclei, which are larger than red blood cells and fewer in number.

(3) The number of red blood cells in the blood is too small, or the hemoglobin content in red blood cells is too low, which is called anemia. Anemia patients have low ability to transport oxygen, which affects the normal physiological activities of various organs in the body; After blood vessels are damaged, platelets in the blood will gather at the bleeding wound. In addition, some substances released by platelet rupture can promote blood coagulation, which can not only seal the wound, but also stop bleeding.

So the answer is: (1) ①; White blood cells; Swallow germs to defend against diseases; several days

(2)① Nucleated, ③ Seedless.

(3)③; Red blood cells; ②; blood platelet