1The new medication is designed to target cancer cells directly in the bloodstream, reducing the risk of side effects.
2The doctor explained that the infection had entered her bloodstream through a cut on her hand.
3Regular exercise helps to improve circulation and increase the flow of oxygen-rich blood through the bloodstream.
4The researchers were studying how the body's immune system responds to foreign substances in the bloodstream.
5In some cases, the virus can lie dormant in the bloodstream for years before symptoms appear.