Life expectancy provides a framework for timing about stages and periods of life.
<h3>What does "life span" mean?</h3>
- life span: the amount of time elapsed between an organism's conception and eventual demise.
<h3>The definition of life expectancy:</h3>
- The average number of years a person who reaches a certain age might expect to live is their life expectancy.
- Estimates of life expectancy from the National Center for Health Statistics offer a trustworthy overview of mortality and population health in the United States.
<h3>Why is this crucial?</h3>
- A common metric for assessing a community's general health is life expectancy.
- Age-specific health is measured by life expectancy at birth.
- Trends in mortality are frequently described in terms of changes in life expectancy.
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11 Systems would happen to be
- Muscular
-Endocrine
-Circulation
-Lymphatic
-Respitory
-Integumentary
-Repreductive
-Urinary
-Digestive
<span> They are unable to pass through the plasma membrane and have different methods of action. They attach to their receptors in the target cell surface and influence activity within the cell through cytoplasmic intermediates called second messengers. </span>
<span>The two most important messengers are cAMP and inositol triphosphate. </span>
<span>Cyclic AMP: ATP is converted into cAMP after a series of reactions on the plasma membrane following the attachment of the hormone to the membrane. cAMP relays the signal from the membrane to the metabolic machinery of the cytoplasm. </span>
<span>Inositol Triphosphate: Involves the use of Ca+2 that regulates cellular protein activity.
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To maintain a stable environment.<span />
Acid drainage, especially acid mine drainage is the process whereby water combines with the sulfide minerals like pyrite which is iron plus sulfur (high in sulfur) to produce sulfuric acid (iron plus sulfur plus oxygen so oxidation of the sulfide like pyrite is part of the process) which is deleterious to the environment so where mine waste contains pyrite then it must be isolated and neutralized with say limestone or submerged in water to prevent the development of sulfuric acid.
