How does blood reach literally every cell in the body? There can’t be capillaries between every single cell when capillaries are also made of cells…. can there?

Question

How does this work?

In: 4868

Answer 1

Blood is made of a yellow liquid called plasma. Plasma carries food,hormones,water, protiens and other essential components. When the blood reaches its target cells by travelling through blood vessels,all these essential components travel out of the blood vessel except for blood protiens as they are too big. Think of it as a fat person unable to move through a narrow door. This liquid is now known as tissue fluid. Tissue fluid and red blood cells can travel out of the blood vessel and into the cell by passing through the plasma membrane. Plasma membrane works like security guards who control what goes into and out of the cell.