Because they Are so small they can't get out.
Too small or Llams oot
All the body cells can stay close to the capillaries for the exchange for materials with the blood
Yes, urea and glucose remain in the capillaries, while blood cells and protein molecules are filtered out and move into the capsule of a nephron during the process of renal filtration. This filtration is part of the first step in the formation of urine in the kidneys.
Nothing as erythrocytes (i.e. red blood cells) are never"pumped into cells". They stay inside the blood vessels, circulating around and around.
Capillaries. Red cells that group together normally tend to do so in rouleaux; those that stay as individuals will have greater opportunities to absorb oxygen. If they pass through capillaries individually will be more efficient as transporters of oxygen.
Materials are exchanged between cells and the blood mainly at the capillaries. Capillaries are tiny blood vessels with thin walls that allow for the exchange of gases, nutrients, and waste products between the blood and surrounding tissues. This exchange process occurs through the process of diffusion.
Viruses stay inside the cells. They can not be attacked by the white blood cells. Bacteria are usually stay outside the cells. They are readily attacked by the white blood cells. There is fight between white blood cells and bacteria. Pus contains the dead bacteria and dead white blood cells. That is why the pus formation occurs in bacterial infection only. This is the probable answer to above question.
because it can flow also blood in these blood vessels or the stay there if the cells need oxygen
Why do you think that the blood cells stay in the blood vessels
Because is where it has to stay. To make the blood continue.
Fight Germs or you will have to stay in a bubble.
I believe they stay there