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Body Temperature, Energy and Heat Loss
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Body Temperature, Energy and Heat Loss
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Body Temperature, Energy and Heat Loss
Which of the following statements is correct? As a means of losing heat from the body, evaporation of sweat works:
Provided that the surrounding air is not saturated with water vapour
Provided that the surrounding environment is at a lower temperature than the body
Because sweat is at a lower temperature than blood
Because a film of sweat acts as an absorber of infrared radiation from the surroundings
Sweat will evaporate, and cooling will be achieved as long as the air is not already saturated with water vapour.
Author:
rikazzz
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Body Temperature, Energy and Heat Loss
How does an “infrared thermometer” determine body temperature?
It detects radiation emitted from the body and converts that to a skin temperature.
It directs an infrared beam at the skin and from the reflected energy deter-mines skin temperature.
It detects radiation from the body surface and converts that to a core temperature.
It directs a laser beam at the skin and from the amount absorbed and determines a core temperature.
An IR “thermometer” has a sensor that detects emitted IR radiation. The radiated energy is proportional to the fourth power of temperature of the radiating body (Stefan-Boltzmann law), so the detected IR is converted to a core temperature by the device electronics (surface temp is not of interest). Choice D is wrong, while choice B is nonsense.
Author:
rikazzz
Comment
Body Temperature, Energy and Heat Loss
Which one of the following statements best describes what is meant by the “principle of conservation of energy”?
Internal energy is the sum of kinetic energy, thermal energy and potential energy.
Energy may be transformed from one form into another, but it cannot be created or destroyed.
Kinetic energy is gradually transformed into potential energy and vice versa.
The Earth has a finite amount of energy, and modern society must learn to use less of it and to use it more efficiently.
Energy is noticed when it is transformed from one form to another. However, the total amount, when all of its forms are accounted for, does not change.
Author:
rikazzz
Comment
Body Temperature, Energy and Heat Loss
What is the healthy human core body temperature?
Below 38 °C except during fever.
It lies between 36.5 and 37.5 °C.
It lies between 36 and 37 °C.
It lies between 37 and 38 °C.
Healthy human body temperature is close to 37. It can be elevated to 38 (and more) by vigorous activity.
Author:
rikazzz
Comment
Body Temperature, Energy and Heat Loss
What is a definition of the temperature of an object?
Temperature is a measure of the average kinetic energy of the particles of the object.
Temperature is the amount of heat energy contained within the object.
Temperature is the amount of energy that flows from the object being measured to the thermometer.
Temperature is a measure of the hotness (or coldness) of the object.
The faster the particles of an object are vibrating, the higher is its temperature. Temperature is the average kinetic energy of its particles.
Author:
rikazzz
Comment
Body Temperature, Energy and Heat Loss
Work is done when an object is moved by a force. What is energy?
The capacity to do work
The rate at which work is done
A force that results in no movement
The transformation of work from one form to another
Choice B refers to power. Choice C refers to a balanced force.
Author:
rikazzz
Comment
Body Temperature, Energy and Heat Loss
Consider a person whose diet provides a daily energy intake of 10,500 kJ and whose daily activities result in their body consuming 9500 kJ of energy daily. If this situation continues for several months, the possible outcome would be:
A gradual rise in basal metabolic rate.
The person increases their mass by several kilograms of fat tissue.
The energy requirements of daily activities will rise to consume 10,500 kJ.
An increase in radiation from the body to dissipate excess energy.
If energy intake is greater than energy expenditure, the person will store the excess energy as fat and will get fatter.
Author:
rikazzz
Comment
Body Temperature, Energy and Heat Loss
Which heat loss avenues are reduced by wearing clothes?
Radiation and evaporation
Conduction and convection
Evaporation and convection
Radiation and conduction
Clothes trap air between the clothes and skin, minimising convection. Clothes lying between skin and a contacting surface insulate against conducting losses. Radiation is not prevented by clothing.
Author:
rikazzz
Comment
Body Temperature, Energy and Heat Loss
How does subcutaneous adipose tissue assist the body to regulate its temperature?
It conducts heat more readily than lean tissue so promotes heat loss.
It stores heat energy so acts like a “heat sink”.
It produces sweat for secretion via sweat glands.
It conducts heat less readily than lean tissue so insulates the body.
Adipose tissue (fat) conducts heat less readily than does lean tissue. Hence a layer of fat insulates the body against heat loss.
Author:
rikazzz
Comment
Body Temperature, Energy and Heat Loss
Which of the following factors contributes LEAST to the human sensation of “hot” or “cold” when an object is touched?
The amount of heat in the object
The temperature of the object being touched
The thermal conductivity of the object
The local skin temperature
The amount of heat in an object depends on the size of the object. The sensation of hot or cold depends on the other three things.
Author:
rikazzz
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