Acute hypothermia is caused by prolonged exposure to a cold environment. Hypothermia results when the internal body temperature drops below normal limits.
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Running in the morning strengthens your heart, and improves stamina after a while.
Hope this helps! ^~^
Satisfaction in economic terms is the benefit that an individual gains from consuming a given amount of goods or services.
Maximizing satisfaction means receiving the most benefits with relatively few costs.
There is also additional bit of satisfaction, or amount of utility, gained from each extra unit of consumption. This is called a marginal utility.
Answer:
B) Valves closing
Explanation:
A healthy heart makes a lub-dub sound with each beat. This sound comes from the valves shutting on the blood inside the heart. The first sound (the lub) happens when the mitral and tricuspid valves close.
