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Ch 24

Metabolic Rate and Temperature Regulation

The higher the relative humidity The lower the rate of evaporation
This is a mechanism of heat transfer that involves direct contact conduction
The loss of heat in the form of infrared waves is termed this radiation
Which of the choices below is NOT a mechanism of heat production sweating
Heat-losss mechanisms do NOT include this physical activity
The amount of this substance that is released is probably the most important hormonal factor in determining BMR thyroxine
Many factors influence BMR. What is the most critical factor the ratio of surface area to volume (weight) of the body
The primary reason elderly people should decrease their caloric intake is that muscle mass and metabolism decline with age
When a person's hypothalamic thermostat is set to a higher level and the actual body temperature is below that level, the person may do this shiver
BMR stands for basal metabolic rate True
A fever results when the hypothalamic thermostat of the body is reset True
Thyroxine, a hormone from the thyroid gland regulates a person's resting BMR and ATP production True
Increased body temperature excites neurons and decreases the activity of many enzymes False
Heat exhaustion is usually associated with vigorous physical activity, dehydration, and low blood pressure True
As the body temperature decreases in hypothermia, shivering stops as about 32C and cardiac arrest occurs at about 21C True
During heat stroke , the skin becomes hot and dry and body temperature spirals upward True
Cryogens tend to raise body temperature and pyrogens tend to lower body temperature False
Basal metabolic rate can be measured directly with a (calorimeter, respirometer) calorimeter
The pre optic center in the (cerebellum, hypothalamus) is the main integrating center for thermoregulation hypothalamus
Sources of nutrients and chemical energy comes from a general nutritional source called (fuel, food) food
This category of substances that contain chemical energy, captured long ago, that humans use for heat and conversion to other types of energy is commonly called (fuel, food) fuel
Normal body temperature us _____C and ____F 37, 98.6
The release of ____, a hormone, from the ____ gland increase metabolic rate and is a heat promoting mechanism thyroxine, thyroid
Animals insure that they obtain their nutrients in the proper form and proper concentration by eating, directly or indirectly, the flesh of ___ or ____ animals, plants
Chemical energy that powers life on Earth originates from this type of energy- ______ light
The daily energy requirement needed to power the life of the average adult is about _____ calories 2500
Todays modern farmers and ranchers support over wide the number of humans that the Earth could normally support without modern technology and these energy sources- _____ fossil fuels
Today, modern farming and ranching allows over 90% of humans to live and work in ____ rather than to live on farms producing food cities
This byproduct of fossil fuel usage is leading to climate change and ocean acidification- ____ carbon dioxide
_____ is the energy conversion process found in green ____ that produces the chemical energy that is transferred among and shared by other living things Photosynthesis, plants
Created by: lawalk