Medical Science

Oxygen is extremely important to all the cells of our body. Without oxygen molecules (O2) we will begin to die within three to four minutes, unless our bodies are much cooler than normal, such as, when immersed in cold water….
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Blood circulates in our bodies through an amazing network of blood vessels called arteries, veins and capillaries. Capillaries are the smallest blood vessels, being thin and fragile with a diameter of only ten micrometres. They are made of endothelium, a…
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The human cardiovascular (CV) system has three types of blood vessels: arteries, capillaries and veins. Circulation through the CV system goes from the heart through the arteries to the capillaries, on to the veins and back to the heart. The…
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During pregnancy the fetal circulatory system works differently than it does after birth. The fetus is connected by the umbilical cord to the placenta. The placenta is an organ that develops and implants in the mothers uterus to provide oxygen…
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The Hypothalamus Some behaviors are so automatic that they are almost reflexes. Automatic responses to stimuli are largely controlled by the hypothalamus. The hypothalamus sits behind eye orbits in a human skull. Looking at a side view of the skull,…
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Introduction: Saliva is a secretion made from the salivary glands located around the oral cavity. There are three types of such glands and Submandibular glands contribute to at least 70% of the total salivary secretions whereas the Parotids only contribute…
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The heart distributes fresh oxygen to all parts of the body, in fact it has everything to do with circulation. Without it beating there would be no blood circulating, and without this there would be no  live activity. Or, if…
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The human circulatory system has nearly 60,000 miles of blood vessels. These vessels provide a mode of transport for erythrocytes (red blood cells) leukocytes (white blood cells), platelets and plasma. It is the red blood cells that carry oxygen and…
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Taste is the sensing of flavor in food and other material that is ingested. Taste is possible because chemicals stimulate receptors on the tongue, the taste buds. How something tastes can tell an individual whether that something is food or…
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Capillary diffusion allows blood to deliver nutrients to cells. Human blood flows through blood vessels to deliver nutrients to cells. Blood is really liquid connective tissue. Like other tissues of the body it has cells, but cells in blood are…
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