Blood is the tissue that not only carries cells that transport oxygen, for example, the red blood cells, or fights infectious diseases, but it also carries messenger molecules, hormone-like factors that transport information from one cell to another, from one tissue to another, including the brain.
血液は酸素を運ぶ赤血球細胞や 感染症と闘う免疫細胞だけでなく シグナル伝達分子すなわち ホルモンのような 細胞や組織間の情報伝達をする 因子をも運搬します 脳においても同様です