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.
From the capillaries, blood enters the venules and then veins, and travels back to the heart to be refreshed and sent out once again. In conclusion, the heart works as a pump which provides nutrients to every organ, tissue, and cell throughout your body by means of circulating blood (the circulatory system).