Monthly Archives: April 2011

Tooth Anatomy

Teeth and Their Parts Each tooth has two main parts, the crown and the root. The crown and the root meet at the neck of the tooth, which is normally just below the gum margin. The tooth The crown This … Continue reading

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Heart Anatomy

Overview of Heart Anatomy Coronary Arteries Because the heart is composed primarily of cardiac muscle tissue that continuously contracts and relaxes, it must have a constant supply of oxygen and nutrients. The coronary arteries are the network of blood vessels … Continue reading

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Heart Conduction System

Heart’s electrical system controls all the events that occur when our heart pumps blood. The cardiac conduction system is also called the electrical system. The sinoatrial node (SAN), located within the wall of the right atrium (RA), normally generates electrical … Continue reading

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Types of Sleep

Sleep was long considered just a uniform block of time when you are not awake. Thanks to sleep studies done over the past several decades, it is now known that sleep has distinct stages that cycle throughout the night in … Continue reading

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Protozoa-Basic Facts

Protozoa, from the Greek meaning ‘first animal’, refers to simple, eukaryotic organisms composed of a microscopic single cell. Reproduction is through simple asexual cell division, or binary fission, in which two daughter cells are formed or, if many daughter cells … Continue reading

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Fungi

Fungi are eukaryotic organisms that comprise yeasts, moulds (filamentous fungi) and higher fungi (mushrooms and toadstools). They are widely distributed in the environment and can survive in extreme conditions where nutrients limited. Most fungi are saprophytes (living off dead organic … Continue reading

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Hypothalamus-Pituitary-Adrenal axis (HPA axis)

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