It increases heart rate, constricts blood vessel and
dilates air passages in order to deliver more blood to the muscles and
more air to the lungs and thus help a human survive in a dangerous or
unexpected situation. This is the mechanism of action of a hormone,
called
adrenaline or
epinephrine. The word
“adrenaline” today is, perhaps, the only example of a medical term, known and used widely beyond medical sphere. It has become a
synonym for excitement, passion, adventure, and risk,
and it is now closely associated with extreme activities, such as
mountaineering, jumping, and challenging sports, such as racing,
parachuting, or skiing. We have devoted our today’s gallery of
photographs to all kind of activities, where
adrenaline plays the leading role, being at the same time the aim and the means of achieving that aim.

Why do people do such seemingly crazy and obviously dangerous things,
as jumping from high rocks into the sea, participating in rodeo, or
feeding wild animals with bare hands? Of course, the reasons are
multiple and different: from love to the wild nature to excitement of
the free fall, but in every situation you will find the similar
component – adrenaline. This hormone puts a human body into such a
unique physiological state, which is both dangerous and cherished
simultaneously. The one, who once experienced the influence of
adrenaline charge, will definitely urge for the same experience again in
the future. That is why, drivers usually return to racing even after
the most dreadful accidents, and people of all ages return to the ferris
wheel or roller coaster even if they were frightened to death, visiting
those attractions earlier. Obviously, people love adrenaline… Some of
the ways to get it are described on the pictures below, but, please, do
not take this post as the guideline or direct motivation towards
specific actions!
*** by Evgeny Vasenev