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Physical or emotional attack on the body can each result in
either physical or emotional disease. An infection is a physical
problem but if it prevents you from undertaking an activity such
as a vacation you may become depressed. Emotional disturbance
may lead at one extreme to anorexia and at the other to obesity
and these adversely affect general physical health.
In most respects, our bodies function automatically without any conscious
control. This is particularly true of defence mechanisms.
Adrenaline is a hormone released from the adrenal glands which
are situated above the kidneys. There is an adrenaline surge to
take us through acute episodes of stress, so that adrenaline has
been called a 'fight or flight' hormone. The immune system is a
complex integrated mechanism for destroying any invasion into
the body, whether this be by organisms (infection), a chemical,
a foreign body, or transplanted tissue.
The immune system is also responsible for removing damaged or dead cells
from the tissues. It has been one of the more difficult areas of
physiology and pathophysiology (the assessment of the body's
response to ill health) to study. Whereas, most body functions
are largely confined to single organs (e.g. the skeleton, bowel,
kidneys or the heart), much of the immune system is dependent on
circulating cells and specialised immune cells spread throughout
all the tissues of the body.
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