Muscular system

Muscle is a soft tissue of animals. Muscle cells contain protein filaments that slide past one another, producing a contraction that changes both the length and the shape of the cell. Muscles function to produce force and cause motion. They are primarily responsible for maintenance of and changes in posture, locomotion of the organism itself, as well as movement of internal organs, such as the contraction of the heart and movement of food through the digestive system via peristalsis.
Muscle tissues are derived from the mesodermal layer of embryonic germ cells. They are classified as skeletal, cardiac, or smooth muscles. Cardiac and smooth muscle contraction occurs without conscious thought and is necessary for survival. Voluntary contraction of the skeletal muscles is used to move the body and can be finely controlled. Examples are movements of the eye, or gross movements like the quadriceps muscle of the thigh.
Muscles are predominantly powered by the oxidation of fats and carbohydrates, but anaerobic chemical reactions are also used, particularly by fast twitch fibers. These chemical reactions produce adenosine triphosphate (ATP) molecules which are used to power the movement of the myosin heads.
The term muscle is derived from the Latin musculus meaning "little mouse" perhaps because of the shape of certain muscles or because contracting muscles look like mice moving under the skin.

Top 10 Incurable Diseases

10. Ebola 
9. Polio
8. Lupus Erythematosus
7. Influenza
6. Creutzfeldt-Jakob Disease
5. Diabetes
4. HIV/AIDS
3. Asthma
2. Cancer
1. The Common Cold

Disease

A disease is an abnormal condition affecting the body of an organism. It is often construed to be a medical condition associated with specific symptoms and signs. It may be caused by external factors, such as infectious disease, or it may be caused by internal dysfunctions, such as autoimmune diseases. In humans, "disease" is often used more broadly to refer to any condition that causes pain, dysfunction, distress, social problems, or death to the person afflicted, or similar problems for those in contact with the person. In this broader sense, it sometimes includes injuries, disabilities, disorders, syndromes, infections, isolated symptoms, deviant behaviors, and atypical variations of structure and function, while in other contexts and for other purposes these may be considered distinguishable categories. Diseases usually affect people not only physically, but also emotionally, as contracting and living with many diseases can alter one's perspective on life, and their personality.
Death due to disease is called death by natural causes. There are four main types of disease: pathogenic disease, deficiency disease, hereditary disease, and physiological disease.
Diseases can also be classified as communicable and non-communicable disease.

Story of a man

The history of the world here refers to the history of humanity, throughout the entire Earth, generally beginning with the Paleolithic Era. Distinct from the history of Planet Earth (which includes early geologic history and pre-human biological eras), world history encompasses the study of archeological and written records, from ancient times forward. Ancient recorded history begins with the invention of writing. However, the roots of civilization reach back to the period before the invention of writing. Prehistory begins in thePaleolithic Era, or "Early Stone Age," which is followed by the Neolithic Era, or New Stone Age, and the Agricultural Revolution (between 8000 and 5000 BCE) in the Fertile Crescent. The Neolithic Revolution marked a change in human history, as humans began the systematic husbandry of plants and animals. Agriculture advanced, and most humans graduated from a nomadic to a settled lifestyle as farmers in permanent settlements. Nomadism continued in much of society, especially in isolated regions with few domesticable plant species; but the relative security and increased productivity provided by farming allowed human communities to expand into increasingly larger units, fostered by advances in transportation.As farms developed, grain agriculture sophisticated, and prompted a division of labor to store food between growing seasons. Labour divisions then led to the rise of a leisuredupper class and the development of cities. The growing complexity of human societies necessitated systems of writing and accounting.Many cities developed on the banks of lakes and rivers and by 3000 BCE, some of the first prominent, well-developed settlements had arisen in Mesopotamia, on the banks of Egypt's River Nile , and in theIndus River valley. Similar civilizations probably developed along major rivers in China, but the archaeological evidence for extensive urban construction is less conclusive.The history of the Old World (Europe in particular, but also the Near East and North Africa) is commonly divided into Antiquity, up to 476 CE; the Middle Ages, from the 5th through the 15th centuries, including the Islamic Golden Age (c .750 CE - c.1258 CE) and the early European Renaissance (beginning around 1300 CE); the Early Modern period, [20] from the 15th century to the late 18th, including the Age of Enlightenment; and the Late Modern period, from the Industrial Revolution to the present, including Contemporary History. In Western histories, the ostensible "Fall of Rome" in 476 CE is commonly taken as signaling the end of antiquity and the beginning of the Middle Ages. By contrast, Eastern Europe saw a transition from the Roman Empire to the Byzantine Empire, which did not decline until much later. In the mid-15th century, Johannes Gutenberg's invention of modern printing, employing movable type, revolutionized communication, helping end the Middle Ages and usher in the Scientific Revolution. By the 18th century, the accumulation of knowledge and technology, especially in Europe, had reached a critical mass that brought about the Industrial Revolution.Elsewhere, including the ancient Near East, ancient China, and ancient India, historical timelines unfolded differently, as exemplified in China's Four Great Inventions, the Islamic Golden Age, and Indian mathematics. By the 18th century, however, due to extensive world trade and colonization, most civilizations became increasingly globalized. In the last quarter-millennium, the rate of growth of population, knowledge, technology, commerce, weapons destructiveness and environmental degradation has greatly accelerated, creating opportunities and perils that now confront the planet's human communities.