Transcript:
Have you ever had that “butterflies
in your stomach” feeling before giving a presentation? Has a friend who has a
severe allergy to a food ever told you about their EPI-pin? These reactions are
caused by the hormone Epinephrine, which is more commonly known as adrenalin as
it is secreted by the adrenal glands.Epinephrine is a water soluble
hormone, meaning that it is able to be absorbed into the blood stream. Also, it
has a positive feedback loop, meaning that it continues to increase itself, as
opposed to shutting itself down. The receptor for epinephrine is the adrenergic
receptor which is located on the plasma membrane of primarily liver cells.The release of adrenaline is
triggered by high stress situations such as heat, bright lights, excitement,
noise or especially physical threat. The two key enzymes, dopamine-hydroxylase
and tyrosine-hydroxylase, are the two catalysts in beginning the synthesis of
adrenaline, which results in the release of adrenaline into the blood stream. The primary function of epinephrine is to
increase blood flow throughout the body. In situations such as cardiac arrest
or anaphylactic shock, an Epi-pin would help bllod to keep flowing and
hopefully save a person’s life.
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