Ko ngā whēkau, ko ngā repe rānei ka whakaputa i ngā matū hei whakahaere i ngā tukanga ora o te tinana, pērā i te tupu me te whakaputa pūtau toto. Ka kīia ēnei matū he taiaki. Ka tukuna ngā taiaki ki roto i ngā toto, ka kawea haerehia ki ngā wāhanga o te tinana.
The body organs or glands which produce chemicals that control processes such as growth and the production of blood cells. These chemicals are called hormones. Hormones are released into the blood stream and carried to the various parts of the body.