1. Insulin <br />Convert glucose to glycogen.<br />Pituitary <br />Found at the base of the brain.<br />Pancreas <br />When the cells that produce insulin in one’s pancreas are destroyed, he/she gets diabetes.<br />Testosterone <br />Causes the development of men’s secondary sex characteristics.<br />Glucagon <br />Break down glycogen to release glucose.<br />Adrenal <br />This gland secretes hormones when one is scared.<br />Ovary <br />Controls the mentrual cycle.<br />In animal anatomy the endocrine system is a system of glands, each of which secretes a type of hormone into the bloodstream to regulate the body. <br />The endocrine system is an information signal system like the nervous system.<br />Hormones regulate many functions of an organism, including mood, growth and development, tissue function, and metabolism.<br />The field of study that deals with disorders of endocrine glands is endocrinology, a branch of internal medicine.<br />The endocrine system is made up of a series of ductless glands that produce chemicals called hormones.<br />A number of glands that signal each other in sequence is usually referred to as an axis, for example, the hypothalamic-pituitary-adrenal axis.<br />Typical endocrine glands are the pituitary, thyroid, and adrenal glands. Features of endocrine glands are, in general, their ductless nature, their vascularity, and usually the presence of intracellular vacuoles or granules storing their hormones.<br />In contrast, exocrine glands, such as salivary glands, sweat glands, and glands within the gastrointestinal tract, tend to be much less vascular and have ducts or a hollow lumen.<br />In addition to the specialised endocrine organs mentioned above, many other organs that are part of other body systems, such as the kidney, liver, heart and gonads, have secondary endocrine functions.<br />For example the kidney secretes endocrine hormones such as erythropoietin and renin.<br /> HYPERLINK quot;
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Permanent Link to [Science Form 4] Molecular Or Ionic?quot;
[Science Form 4] Molecular Or Ionic?<br />Thursday, January 21st, 2010 <br />When one or more electrons are transferred from one atom to another, the atom that gains the electron or electrons becomes negatively charged whereas the atom that loses the electron or electrons becomes positively charged. <br />These atoms with their positive or negative charges are called ions.<br />The number of protons and electrons differ in an ion. There are more protons than electrons in a positively-charged ion. <br />In contrast, there are more electrons than protons in a negatively-charged ion.<br />Some atoms like sodium atoms, potassium atoms and fluorine atoms are very reactive as they can easily turn into ions by losing or gaining electrons.<br />Meanwhile, two or more elements can bond together to form compounds. The bond can either be molecular or ionic. When atoms share electrons in covalent bonds, molecular or covalent compounds are formed.<br />In contrast, ionic compounds are made up of positive and negative ions in ionic bonds.<br />Physical properties of molecular and ionic compounds<br /> HYPERLINK quot;
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Permanent Link to [Science Form 4] Numbers In Symbolsquot;
[Science Form 4] Numbers In Symbols<br />An atom, which is the smallest unit of all matter, consists of a nucleus and an outer region. <br />The nucleus at the centre of an atom contains nucleons (protons and neutrons), and is surrounded by electrons orbiting in the outer region.<br />A neutral or stable atom has an equal number of protons and electrons.<br />The number of protons, also called the atomic number, is written as a subscript to the left of the element symbol. <br />In contrast, the total number of protons and neutrons, also called the nucleon number or mass number, is written as a superscript to the left of the element symbol.<br />