While hearing your test marks,
some may have anxiety and some may hesitate to hear and some may be worried. Do
you know the reasons for such immediate changes? While seeing any unexpected
happenings, we get goose bumps. Do you know the reason, why?
These are all due to the
biochemical changes happening in our body, Which are created by the endocrine
system. The above mentioned biochemical changes are due to the hormone
adrenalin (flight, fright and fight hormone).
Endocrine glands and hormones
Physiological functions of our human body is
regulated and coordinated by both neural and endocrine systems. The endocrine
system influences the metabolic activities by means of hormones (hormone means to
excite ) which are chemical messengers released into the blood and
circulated as chemical signals and acts specifically on certain organs or tissues
called target organs or target tissues. Hormones may speed up or slow down or
alter the activity of the target organs. The hormones secreted do not remain
permanently in the blood but are converted by the liver into inactive compounds
and excreted by the kidneys.
Hormones are chemical messengers because they act
as organic catalysts and coenzymes to perform specific functions in the target
organs. The target organs contain receptor molecules either on the surface or
within the cell. Although different hormones come in contact with cells, only
the cells that contain receptor molecules specific for the hormone are
physiologically activated. A single hormone may have multiple effects on a
single target tissue or on different target tissues.
Many hormones exhibit long term changes like
growth, puberty and pregnancy. Hormones often influence many organs and organ
systems at the same time. Serious deficiency or excess secretion of hormones
leads to disorders. Hormones coordinate different physical, physiological,
mental activities and Maintain homeostasis. Hormones are composed of water
soluble proteins or peptides or amines or fat soluble steroids.