Biology - Surviving Under Changing Conditions - Hormonal Systems
Endocrine  glands produce hormones - substances of variable chemical
composition; for example, proteins, amino acids, peptides, steroids and
fatty acids. These are released directly into the bloodstream - though not
through ducts (therefore called ductless glands) - and provoke a response
on reaching target cells and tissues. Hormonal coordination and control
regulate physiological responses to changes in conditions.
You should be familiar with the major endocrine glands including:
* pituitary gland (the master gland which secretes at least 9 hormones
affecting other endocrine glands)
* thyroid and parathyroids
* adrenal glands
* pancreas (beta cells)
You should also be familiar with the hormones these glands produce and the
target tissue or organ.
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