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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).
It can require up to 20 percent of the body's energy—more than any other organ—despite making up only 2 percent of the human body weight. [ 16 ] [ 17 ] If most of it were unnecessary, there would be a large survival advantage to humans with smaller, more efficient brains.
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.
In a 72 kg (159 lb) body containing 40 litres of fluid, about 25 litres is intracellular, [9] which amounts to 62.5%. Jackson's texts states 70% of body fluid is intracellular. [10] Extracellular fluid (1/3 of body water) is fluid contained in areas outside of cells. For a 40-litre body, about 15 litres is extracellular, [9] which amounts to 37.5%.
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 and foreign substances. The cancer of leukocytes is called leukemia.
The human body needs iron for oxygen transport. Oxygen (O 2) is required for the functioning and survival of nearly all cell types. Oxygen is transported from the lungs to the rest of the body bound to the heme group of hemoglobin in red blood cells. In muscles cells, iron binds oxygen to myoglobin, which regulates its release.
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 ...