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The term "Freshman 15" is an expression commonly used in the United States and Canada to refer to weight gain during a student's first year in college.Although the 15 refers to a 15 lb. (6.8 kg) weight gain, the expression can apply to weight gain in general.
Although the human brain represents only 2% of the body weight, it receives 15% of the cardiac output, 20% of total body oxygen consumption, and 25% of total body glucose utilization. [138] The brain mostly uses glucose for energy, and deprivation of glucose, as can happen in hypoglycemia, can result in loss of consciousness. [139]
The axial skeleton (80 bones) is formed by the vertebral column (32–34 bones; the number of the vertebrae differs from human to human as the lower 2 parts, sacral and coccygeal bone may vary in length), a part of the rib cage (12 pairs of ribs and the sternum), and the skull (22 bones and 7 associated bones).
The combined surface area of all red blood cells of the human body would be roughly 2,000 times as great as the body's exterior surface. [ 14 ] 4,000–11,000 leukocytes : [ 15 ] White blood cells are part of the body's immune system ; they destroy and remove old or aberrant cells and cellular debris, as well as attack infectious agents ...
The volume of body fluid, blood glucose, oxygen, and carbon dioxide levels are also tightly homeostatically maintained. The volume of extracellular fluid in a young adult male of 70 kg (154 lbs) is 20% of body weight – about fourteen liters. Eleven liters are interstitial fluid and the remaining three liters are plasma. [7]
They make up a large part of foods such as rice, noodles, bread, and other grain-based products, [14] [15] but they are not an essential nutrient, meaning a human does not need to eat carbohydrates. [16] Monosaccharides contain one sugar unit, disaccharides two, and polysaccharides three or more.
Lipid-rich, collagen fiber-laced blubber comprises the hypodermis [2] and covers the whole body, except for parts of the appendages. It is strongly attached to the musculature and skeleton by highly organized, fan-shaped networks of tendons and ligaments, can comprise up to 50 per cent of the body mass of some marine mammals during some points in their lives, and can range from 5 cm (2 in ...
A scanner used to measure bone density using dual energy X-ray absorptiometry. Bone density, or bone mineral density, is the amount of bone mineral in bone tissue.The concept is of mass of mineral per volume of bone (relating to density in the physics sense), although clinically it is measured by proxy according to optical density per square centimetre of bone surface upon imaging. [1]