The circulatory or cardiovascular system is responsible for moving nutrients, wastes and gases between body cells, transporting blood across the whole body and battling disease (Circulatory System). Its principal elements are the heart, numerous blood vessels, and blood.The heart forms the circulatory system's core. This 2-sided, 4-chambered pump which distributes blood to various arteries comprises of the right and left ventricles, and right and left atria. The ventricles, situated within the heart's lower half, are responsible for pumping blood to the whole body (away from our heart), whilst the atria, situated within the heart's upper half are in charge of receiving blood from different parts of the human body. The right and left ventricles pump de-oxygenated and oxygenated blood, respectively; de-oxygenated blood is pumped to lungs while oxygenated blood is pumped to the remainder of the human body (smith, 2013). These 4 chambers are connected to one another by means of valves which control blood flow and make sure its movement is unidirectional.
Blood vessels denote a sequence of elastic tubes which transport blood from and to the heart. Blood infused with oxygen exits the heart, supplying nutrients and oxygen by means of arteries throughout the body. After traversing the capillaries, the veins take wastes and deoxygenated blood back to the heart via the two vena cavae. Blood that exits the right ventricle via the pulmonary artery is oxygenated within the lungs. Carbon dioxide in the blood is disposed, and the blood goes back through the pulmonary veins to the left atrium and ventricle (smith, 2013). The process repeats in the same way.
The partly-viscous fluid, blood comprises of white (WBC) and red (RBC) blood cells, plasma, and platelets. Plasma refers to watery matter containing sugars, proteins, minerals and fats. In one cardiac cycle, ten pints of blood, on an average, travel across an adult's body. The RBCs contain hemoglobin, a substance whose function is transportation of oxygen to cells and return of carbon dioxide to the heart.
Water: The Only Liquid the Body Needs To live a fully healthy and functional life, water is indispensible. From the point in history when primitive species moved from the oceans to land, a major factor of survival has continually been stopping dehydration. The important adaptations that enable this are present in almost all species of animals, including man. Water makes up varying percentages of the body weight of humans from 75%
Anatomy and Physiology of the Skeletal and Muscular SystemsIntroductionToday, human health is being threatened on multiple fronts and it is not surprising that there is growing interest in developing a better understanding about the human body�s various systems and the respective roles they play in maintaining good health. Some people may intuitively recognize the importance of the skeletal and muscular systems to human health, but far too few understand the
Human Space Travel: Environmental and Health Effects Ever since people first looked up at the stars, mankind has wondered about going into space. What was up there? What would it be like? Was there life, looking back at them? Some of these questions have been answered by NASA and the space program, and some of the questions remain. However, it is no secret that space travel has effects on the human
The work environment, for example, could be conducive to this type of stress, as can the relationship with other employees and with supervisors. This type of fatigue is vastly different from the mental or physical fatigue of direct work overburden, and is also more subtle than these types of fatigue. It should therefore be carefully monitored in terms of its nature and how it interacts with other types of fatigue,
"NASA refused to comment on the information about the Russian expedition to Mars, but they said that they are studying the project with great interest. An American astronaut might possibly join the Russian cosmonauts, taking into account of the fact that Russia and the U.S.A. manage to settle economic discrepancies," in terms of financial support for the program. Still, "America plans to spend money to help prepare for this
Human Factors in Aviation Brief Historical Background The Airline Industry has a history that dates back to 1903 when the Wright brothers made their first successful flight in Kitty Hawk, North Carolina. Initially the public did not take the idea of the airplane travel favorably. But this event marked the beginning of the Airline Industry as more and more inputs were given by people such as Charles Lindbergh who successfully completed a
Our semester plans gives you unlimited, unrestricted access to our entire library of resources —writing tools, guides, example essays, tutorials, class notes, and more.
Get Started Now