Your aging aunt luella has has a series of small strokes. these strokes can progressively damage her brain and are most likely to produce dementia
Explanation:
After repeated stimulation by antigen, B cells can make antibodies that bind their antigen with much higher affinity a process called affinity maturation. ... Thus, antigen stimulation greatly increases the antibody arsenal. Antibodies are proteins, and proteins are encoded by genes.
The burning of fossil fuels releases carbon dioxide and other greenhouse gases these carbon emissions raise global temperatures by trapping solar energy in the atmosphere.
Million of bacteria grow in our gut and each have their own set of genes , that helps them to survive acidic environment of the gut. They can have both beneficial and harmful effect to your health.
While the bacteria in lungs causes symptoms similar to the cold or flu, it can be more severe and typically last longer. Immune system will typically be able to clear a viral lung infection over time. Infections can be cured by using antibiotics also .
On the other hand bacteria on skin can survive up to 20 minutes .Human skin also act as barrier that limits invasion and growth of pathogenic bacteria. Human body has a lot of defenses to keep the bad bacteria from coming in too far through these openings.
To learn more about Bacteria , here
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Veins contain valves that ensure blood flows in only one direction. Valves also help blood travel back to the heart against the force of gravity.
Hope this helps.....
