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Negative effects of stress on the body
· Increased blood pressure ­ During HPAC response
aldesterone is released which increases BP to
increase Oxygen in the blood to vital organs ­
having high BP puts strain on the heart muscle
and can weaken it leading to heart failure ­
Friedman observed heart attack patients in a
waiting room and found they were predominantly
personality type A , which is associated with
aggressive and assertive characteristics, these
findings suggest high stress can increase chances
of having a heart attack.…read more

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Body's ability to heal being impaired
when under stress ­ Marucha studied
this link on how quickly students were
able to heal when under stress ­ a small
incision was on the roof of students
mouths, during exam period and 1
month before ­ findings showed that
during exam period the wounds healed
much slower due to the students being
more stressed during exam period.…read more

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Stress has a negative effect on our body's
ability to prevent illness and infections ­
Cohen researched this on healthy participants
some with high LCU and some with low ­ He
gave participants a nasal drip containing a
virus ­ he found the participants with high
LCUs showed significantly more cold
symptoms than those with low LCUs ­
meaning that more stress will result a person
being more susceptible to becoming ill though
viruses such a cold.…read more

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Negative effects of stress on the
immune system
· Reduced NK cell activity (NK cells protect
against cancer cells and viruses) ­ Kiecolt
Glaser researched link in student 1 month
before exams and during exam period ­
findings showed that NK activity was
significantly reduced in blood samples from
during exam period ­ suggesting that stressors
will reduce the immune system functioning
increasing vulnerability to illness.…read more

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Stress influences the balance between Th1 (an
aggressive response to antigens) and Th2 (a
less aggressive response) ­ when one is active
the other is not ­ Th2 works during the day
and Th1 works at night ­ stress can influence
this balance by causing Th2 to become more
dominant ­ meaning our immune system
would be less aggressive and therefore more
vulnerable to illnesses such as cancer or
tumours.…read more

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