Portal:Human body

HUMAN BODY PORTAL  Science:  History of science     Philosophy of science    Systems science    Mathematics    Biology    Chemistry    Physics    Earth sciences    Technology   edit The Human body Portal The human body is the entire structure of a human organism, and consists of a head, neck, torso, two arms and two legs. By the time the human reaches adulthood, the body consists of close to 10 trillion cells, the basic unit of life. These cells are organized biologically to eventually form the whole body. The organ systems of the body include the musculoskeletal system, cardiovascular system, digestive system, endocrine system, integumentary system, urinary system, lymphatic system, immune system, respiratory system, nervous system and reproductive system. More about human body... edit  watch   Selected Article Obesity is a medical condition in which excess body fat has accumulated to the extent that it may have an adverse effect on health, leading to reduced life expectancy and/or increased health problems. Body mass index (BMI), a measurement which compares weight and height, defines people as overweight (pre-obese) if their BMI is between 25 kg/m2 and 30 kg/m2, and obese when it is greater than 30 kg/m2. Obesity increases the likelihood of various diseases, particularly heart disease, type 2 diabetes, breathing difficulties during sleep, certain types of cancer, and osteoarthritis. Obesity is most commonly caused by a combination of excessive dietary calories, lack of physical activity, and genetic susceptibility, although a few cases are caused primarily by genes, endocrine disorders, medications or psychiatric illness. Evidence to support the view that some obese people eat little yet gain weight due to a slow metabolism is limited; on average obese people have a greater energy expenditure than their thin counterparts due to the energy required to maintain an increased body mass. edit  watch   Selected Picture Much of a person's energy is radiated away in the form of infrared light. Some materials are transparent in the infrared, while opaque to visible light, as is the plastic bag in this infrared image (bottom). Other materials are transparent to visible light, while opaque or reflective in the infrared, noticeable by darkness of the man's glasses. Template:/box-header Click the Various parts of the Image to get Information about it. ...that the dead cells in the body ultimately go to the kidneys for excretion? ...that the human body is 75% water? ...that when a human coughs, we release an explosive charge of air that moves at speeds up to 60 miles per hour? ...that every person has a unique tongue print? ...that the body's largest internal organ is the small intestine with an average length of 20 feet? ...that the largest human organ is the skin, with a surface area of about 25 square feet? ...that there are 60,000 miles of blood vessels in the human body? What are portals? List of portals Featured portals