Quick Answer. The effects of caffeine start within 10 minutes after it is consumed, according to ScienceDaily. However, caffeine requires 45 minutes to reach its maximum concentration in the blood. Continue Reading.
The heart, blood, and blood vessels are the three structural elements that ... These nutrients enter the bloodstream by passing through the walls of the intestine.he heart, blood, and blood vessels are the three structural elements that ... These nutrients enter the bloodstream by passing through the walls of the intestine.
1. The blood has several main functions which circulation permits. A. It carries nutrients to all the cells â mainly from the small intestine, where the food nutrients are absorbed through the intestine wall into the blood. B. Blood circulation carries waste products away from the cells.