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Ch 24
Metabolic Rate and Temperature Regulation
| Question | Answer |
|---|---|
| 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
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