Blood is a liquid in humans and many animals. Blood is pushed through the organism by the heart, and brings nutrients and oxygen to our tissues. It also takes away waste and carbon dioxide from tissues.
Blood is made up of blood plasma and various cells — red blood cells, white blood cells and platelets. Platelets help blood to clot. Hemoglobin is in red blood cells. White blood cells help fight infections and heal wounds.
Xuèyè yóu xuèjiāng, hóngxuèqiú, báixuèqiú hé xuèxiǎobǎn zǔchéng. Xuèxiǎobǎn bāngzhù xuèyè níngjié. Hóngxuèqiú hányǒu xuèsèsù. Báixuèqiú bāngzhù dǐkàng gǎnrǎn hé shāngkǒu yùhé.