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.
Whole blood is a mixture of blood cells and plasma. In addition to the cells mentioned above, the blood also contains clotting factors and other important substances, such as nutrients from the food that has been processed by the digestive system. Blood performs important functions, some of which are as under:-. 2  Supply of oxygen to cells / tissues. 3  Supply of nutrients such as glucose, amino acids and fatty acids Removal of waste such as carbon dioxide, urea and lactic acid.