bloodstream
n.the flow of blood around your body. When you eat food or take medicine, the nutrients or chemicals eventually enter this system to reach your organs.
n.the flow of blood as it circulates through the vascular system of a living organism. Often used to describe the transport of hormones, nutrients, or drugs to various tissues.
“The medicine enters your bloodstream very quickly.”
“After a meal, glucose levels in the bloodstream rise as the body begins to process carbohydrates.”
“The kidneys act as a sophisticated filtration system, constantly removing waste products from the bloodstream while maintaining the delicate balance of electrolytes necessary for cellular function.”
Usually used with the definite article 'the' in singular form when referring to the human circulatory system.
“Deli meats, like most meats, are a good source of protein, which helps build muscle , and iron, which carries oxygen through the bloodstream, delivering it to tissues around your body.”
“That combination gave the team an unusual chance to directly compare immune cells found in the bloodstream with those present in brain tissue after death.”
Common in science writing
From blood + stream.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.