Structure and function of the hypothalamus
By: Corinna Craddock
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, the hypothalamus is seen...
The importance of capillaries for circulation
By: Shaheen Darr
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 single layer of cells that...
The role of the lungs in pulmonary circulation
By: Trenna Sue Hiler
Circulatory systems are necessary for living organisms to transport nutrients, waste and gases from all the cells in the body. Even single cell organisms perform this function and use their surface as an exchange point. In humans, the pulmonary circulation system is just one of...
An overview on diseases of the heart and cardiovascular system
By: JRR
The terms heart disease and cardiovascular disease are often used interchangeably. Heart disease is a broad term used to describe a variety of diseases that affect ones heart and sometimes blood vessels. Cardiovascular disease is a term that generally refers to conditions that involve...
Reasons why oxygen is so important to the blood and cells
By: Perry McCarney
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. Yet individual oxygen atoms...
An overview of pulmonary circulation
By: JRR
The circulatory systems was first discovered by Ibn Naf in 1242. He is considered the father of circulatory physiology and his findings were published in Commentary on Anatomy in Avicennu's Canon. Most Christian factions of the time, condemned the work because it was a...
An overview on how blood vessels deliver nutrients to cells
By: Perry McCarney
All of the living cells of our bodies need nutrients to maintain themselves and carry out their functions. We obtain these nutrients by eating and drinking, with our gastrointestinal (digestive) tract breaking down the food into the components absorbed, mainly through the small intestine...
The role of the placenta in fetal circulation
By: JRR
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 and nutrients to the...
An overview of pulmonary circulation
By: Effie Moore Salem
The pulmonary circulation is a closed system within the body. It works opposite from the artieries and veins. Our first thoughts are oh no, that cannot be so, arteries carry only fresh oxygenated blood and veins are the passageways of blood devoid of most...
Hormone production in the human body
By: Jacqueline Pfaff
Hormones play a crucial role in maintaining homeostasis. They interact with the nervous system to coordinate cellular metabolism. The majority of hormones are produced by endocrine glands. Endocrine glands are categorized into three groups; amino acid based, steroids, and eicosanoids. Amino acid based hormones include...

 

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