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In physiology, body water is the water content of an animal body that is contained in the tissues, the blood, the bones and elsewhere. This water makes up a significant fraction of the human body, both by weight and by volume. ==In animals== The usual way of adding water to a body is by drinking. In addition, water enters the body with foods, especially those rich in water, such as plants, raw meat, and fish. The amount of this water that is retained in animals is affected by several factors. For instance, animal body water amounts vary with the age of the animal. The older the vertebrate animal, the higher its relative bone mass and the lower its body water content. Water in the animal body performs a number of functions: as a solvent for transportation of nutrients; as a medium for excretion; a means for heat control; as a lubricant for joints; and for shock absorption.〔(【引用サイトリンク】title=FCS Animal Production L2 )〕 Most of animal body water is contained in various body fluids. These include Intracellular fluid; Extracellular fluid; Plasma; Interstitial fluid; and Transcellular fluid. Water is also contained inside organs, in gastrointestinal, cerebrospinal, peritoneal, and ocular fluids. Adipose tissue contains about 10% of water, while muscle tissue contains about 75%.〔〔(【引用サイトリンク】title=Nutrient Requirements of Nonhuman Primates: )〕 ==In humans== By weight, the average human adult male is approximately 60% water. However, there can be considerable variation in body water percentage based on a number of factors like age, health, weight, and sex. In a large study of adults of all ages and both sexes, the adult human body averaged ~65% water. However, this varied substantially by age, sex, and adiposity (amount of fat in body composition). The figure for water fraction by weight in this sample was found to be 48 ±6% for females and 58 ±8% water for males.〔See table 1. (here )〕 The body water constitutes as much as 73% of the body weight of a newborn infant, whereas some obese people are as little as 45% water by weight. These figures are statistical averages, and so like all biostatistics, the estimation of body water will vary with factors such as type of population, age of people sampled, number of people sampled, and methodology. So there is not, and cannot be, a figure that is exactly the same for all people, for this or any other physiological measure. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「In physiology, body water is the water content of an animal body that is contained in the tissues, the blood, the bones and elsewhere. This water makes up a significant fraction of the human body, both by weight and by volume.==In animals== body water ) article; caution. -->The usual way of adding water to a body is by drinking. In addition, water enters the body with foods, especially those rich in water, such as plants, raw meat, and fish. The amount of this water that is retained in animals is affected by several factors. For instance, animal body water amounts vary with the age of the animal. The older the vertebrate animal, the higher its relative bone mass and the lower its body water content. Water in the animal body performs a number of functions: as a solvent for transportation of nutrients; as a medium for excretion; a means for heat control; as a lubricant for joints; and for shock absorption.(【引用サイトリンク】title=FCS Animal Production L2 )Most of animal body water is contained in various body fluids. These include Intracellular fluid; Extracellular fluid; Plasma; Interstitial fluid; and Transcellular fluid. Water is also contained inside organs, in gastrointestinal, cerebrospinal, peritoneal, and ocular fluids. Adipose tissue contains about 10% of water, while muscle tissue contains about 75%.(【引用サイトリンク】title=Nutrient Requirements of Nonhuman Primates: )==In humans==By weight, the average human adult male is approximately 60% water. However, there can be considerable variation in body water percentage based on a number of factors like age, health, weight, and sex. In a large study of adults of all ages and both sexes, the adult human body averaged ~65% water. However, this varied substantially by age, sex, and adiposity (amount of fat in body composition). The figure for water fraction by weight in this sample was found to be 48 ±6% for females and 58 ±8% water for males.See table 1. (here )The body water constitutes as much as 73% of the body weight of a newborn infant, whereas some obese people are as little as 45% water by weight. These figures are statistical averages, and so like all biostatistics, the estimation of body water will vary with factors such as type of population, age of people sampled, number of people sampled, and methodology. So there is not, and cannot be, a figure that is exactly the same for all people, for this or any other physiological measure.」の詳細全文を読む スポンサード リンク
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