tag:blogger.com,1999:blog-80084015560835010752024-03-14T01:05:45.585-07:00SCIENCE NOTESJanahttp://www.blogger.com/profile/06636286073606534059noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-8008401556083501075.post-80247658559292149652016-06-09T06:04:00.000-07:002019-01-30T04:47:16.217-08:00ENDOCRINE SYSTEM<div dir="ltr" style="text-align: left;" trbidi="on">
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<b>ENDOCRINE SYSTEM</b></div>
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The chemical coordination of physiological processes to maintain the homeostasis is the work of the endocrine system. The endocrine system controls and coordinates the physical processes of growth, reproduction and sustenance of life.<br />
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The endocrine system consists of a number of endocrine glands and their hormones.<br />
The endocrine glands are ductless glands (without ducts), secreting chemical substances called hormones. The hormones are carried by the blood from the site of production to the site of action.<br />
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The endocrine glands in man are distributed in the different regions of the body without interconnections. The various endocrine glands which are found in different regions of human’s body are as follows:</div>
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<b>Head</b></div>
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a) pituitary gland<br />
b) pineal gland</div>
<b>Neck</b><br />
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a) thyroid gland<br />
b) parathyroid gland</div>
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<b>Thorax</b> </div>
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thymus gland </div>
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<b>Abdomen</b></div>
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a) pancreas – Islets of Langerhans<br />
b) adrenal glands – adrenal cortex and adrenal medulla<br />
c) gonads – testes in man and ovaries in woman</div>
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<b>Hormones</b><br />
Chemical hormones are proteins or steroids. Though the hormones are secreted in small quantities, their performance is profound in action.<br />
<b><br />Pituitary Gland</b><br />
It is a tiny gland, the size of a pea, attached to the hypothalamus of the brain. The pituitary gland regulates the endocrine glands and so it is called as the conductor of the Endocrine Orchestra.<br />
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<b>Divisions of pituitary : </b></div>
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Pituitary gland is divided into an anterior lobe called adenohypophysis and a posterior lobe called neurohypophysis.</div>
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Janahttp://www.blogger.com/profile/06636286073606534059noreply@blogger.com1tag:blogger.com,1999:blog-8008401556083501075.post-73474419626210306382016-06-07T01:44:00.001-07:002020-07-05T02:29:19.984-07:00Blood Vessels<div dir="ltr" style="text-align: left;" trbidi="on">
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<b>Blood Vessels</b><br />
There are three distinct types of blood vessels namely, arteries, veins and capillaries.</div>
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<b>Arteries</b><br />
Arteries carry the blood from the heart to different parts of the body. They are the branches of aorta, supplying oxygenated blood to the various regions of the body (except pulmonary artery which carries deoxygenated blood). The aorta branches into arteries. Arteries branch into arterioles. Arterioles branch into fine tubes called meta arterioles. The meta arterioles end up in the tiny blood vessels called capillaries.<br />
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<b>Capillaries</b><br />
Capillaries are tiny blood vessels that form a network, called capillary network around the tissues. They enable the passage of substances from the blood into the tissues.</div>
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<b>Veins</b><br />
The veins carry the blood from different parts of the body to the heart. The capillaries reunite to form venules, which carry the deoxygenated blood from the tissues. The small venules rejoin the big veins and open into the superior venacava and inferior venacava. Except for the pulmonary veins, all other veins carry deoxygenated blood.</div>
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