Difussion occurs from a high concentrated region to a low concentrated region. The velocity of diffussion is proportional to the differential of concentrations. In the lung arrives blood with low levels of oxygen while the long is rich with fresh oxygen so the oxygen flows from the lung tissues to the blood.
The other tissues consume oxygen continually them they get poor in oxygen and so the oxygen that is in the blood diffuses to the tissue that is poor in oxygen.
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Answer:
Coffee acids
While caffeine is often viewed as the reason why coffee may cause stomach issues, studies have shown that coffee acids may also play a role.
Coffee contains many acids, such as chlorogenic acid and N-alkanoyl-5-hydroxytryptamide, which have been shown to increase stomach acid production. Stomach acid helps break down food so it can move through your gut (11Trusted Source, 12).
That said, while some people have reported that coffee may aggravate heartburn symptoms, research is inconclusive and shows no significant connection (13Trusted Source, 14Trusted Source).
Other additives
In some cases, the coffee isn’t what makes your stomach upset.
In fact, stomach upset could be due to additives like milk, cream, sweeteners, or sugar, which more than two-thirds of Americans add to their coffee (15Trusted Source)
For example, approximately 65% of people worldwide cannot properly digest lactose, a sugar in milk, which may trigger symptoms like bloating, stomach cramps, or diarrhea soon after consuming dairy (16).
Explanation:
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