The Endocrine System Essay

601 Words 3 Pages
The Endocrine System

The function of the endocrine system is to regulate the body functions
by the use of hormones. The structure of the endocrine system is
therefore the structure and location of all the main endocrine glands.
The pituitary gland, thyroid, pancreas, adrenal glands, and the sex
glands (testes) are some of the more important ones, but there are
several others. The glands secrete hormones directly in to the blood,
which act as messengers. The nature of messenger which is released by
the gland, once it has recognised the stimulus is chemical. The
messenger is transported in the blood stream, and its speed is
relatively slow. The messenger then travels to its target cells, and
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The electrical messenger is transmitted through
the nerve cells; this process is a lot faster than the endocrine
system, which enables the response to be that much faster as well.
Another noticeable difference in the two systems is in the type of
receptors, in the endocrine system the type of receptors is cells,
while in the nervous system there are various types of receptors
including heat, pressure. As in the endocrine system, the effects of
the messenger generally takes a long time, in the nervous system the
effect is immediate. And the response is also very localised sometimes
directed at just one muscle.

As I mentioned earlier, in the endocrine system, the function of the
endocrine system is to regulate the body functions by the use of
hormones. There are two types of hormones. Steroid hormones and
Amino-acid based hormones. Steroid hormones are produced by the
Adrenal Cortex, the Ovaries, and the Testes. Steroid hormones don’t
have to bind with the plasma membrane receptors of the target cells;
they enter freely.

Within the cytoplasm, a steroid hormone can bind with a receptor
protein; it will then enter the cell nucleus and bind with the DNA,
where it will trigger changes in the chromosomes. The Hormone
–Receptor unit attaches to the DNA, this attachment activates certain
genes in that cell, causing particular proteins to be produced. Some…