Bone marrow makes all the blood in the human body 骨髓使所有在人体的血液 麻烦采纳，谢谢!

Blood is a combination of plasma (watery liquid) and cells that float in it. It is a specialized bodily fluid that supplies essential substances and nutrients, such as sugar, oxygen, and hormones to our cells, and carries waste...

图片网页上有 History of Blood A Roman doctor named Galen believed that blood was formed in the liver and was unaware that the heart pumped ...