How to estimate loss of water from skin?
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This process is known as insensible water loss.
This term refers to water loss due to:
▪ Transepidermal diffusion: water that passes through the skin and is lost by evaporation, and
▪ Evaporative water loss from the respiratory tract
It is termed insensible as we are not aware of it.
KEY POINT: This is loss of pure water: there is no associated solute loss.
This solute-free water loss differs from sweating as sweat contains solutes. Insensible loss is different from sweating.
▪ Insensible loss from the skin cannot be eliminated. Daily loss is about 400 mls in an adult.
▪ Insensible loss from the respiratory tract is also about 400 mls/day in an unstressed adult.
▪ The minimal insensible loss in an adult is about 800 mls/day. This is equivalent to a heat loss of about 480 kcals/day which is about 25% of basal heat production. On an average unstressed day, activity will increase insensible respiratory water losses so that the overall insensible loss is more than the minimum: an estimate of 50 mls/hr has been suggested for use in unstressed hospitalised patients. In clinical calculations of fluid balance, insensible losses are unmeasured are are usually accounted for by an estimate such as the one above. Metabolic water production (400 mls/day ) is also unmeasured and can be considered to replace up to 50% of the insensible losses.
#BeBrainly
This term refers to water loss due to:
▪ Transepidermal diffusion: water that passes through the skin and is lost by evaporation, and
▪ Evaporative water loss from the respiratory tract
It is termed insensible as we are not aware of it.
KEY POINT: This is loss of pure water: there is no associated solute loss.
This solute-free water loss differs from sweating as sweat contains solutes. Insensible loss is different from sweating.
▪ Insensible loss from the skin cannot be eliminated. Daily loss is about 400 mls in an adult.
▪ Insensible loss from the respiratory tract is also about 400 mls/day in an unstressed adult.
▪ The minimal insensible loss in an adult is about 800 mls/day. This is equivalent to a heat loss of about 480 kcals/day which is about 25% of basal heat production. On an average unstressed day, activity will increase insensible respiratory water losses so that the overall insensible loss is more than the minimum: an estimate of 50 mls/hr has been suggested for use in unstressed hospitalised patients. In clinical calculations of fluid balance, insensible losses are unmeasured are are usually accounted for by an estimate such as the one above. Metabolic water production (400 mls/day ) is also unmeasured and can be considered to replace up to 50% of the insensible losses.
#BeBrainly
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Hey !
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It cannot be controlled or stopped because it is natural process.
Water releasing from skin is a natural way of giving out waste materials in the body. In form of water.
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Thanks !
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