The human body is composed of water, proteins, fat, and minerals. Its specific heat reflects this composition. With 75% water and 25% protein, what would be the specific heat of the body? Differentiate the three ways of heat transfer
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The human body is composed of water, proteins, fat, and minerals. Its specific heat reflects this
composition. With 75% water and 25% protein, what would be the specific heat of the body?
Differentiate the three ways of heat transfer.
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- Explain the terms “core” and “shell” relative to body temperature balance. What serves as the heat-transfer agent from one to the other?Calculate the amount of evaporation that must occur to remove 400 kcal of heat from the body.What are the sources of heat loss for a person immersed up to the neck in a 408C bath? Hint: recall that body temperature is about 378C.
- Skeletal muscles account for approximately 43% of the typical body mass. At rest, they use about 18% of the BMR. Of the total energy burned by the skeletal muscle, only 25% is used for work, and this is the muscular efficiency. What happens to the remaining 75% of energy? Choose the best answer. It is reabsorbed and stored for later use. It is transferred as electrical energy from the muscle to muscle. It is converted to heat to warm the body. It is used to make more ATP.Classify heat capacity and specific heat capacity as an extensive or intensive property. heat capacity |(select) specific heat capacity |(select) 00What is thermoregulation and why is it necessary for the human body to function properly? List two physiological responses the human body takes to when its core temperature gets too high. Briefly explain how each works to reduce core temperature. Explain why one of these responses will not work if the air temperature is extremely high. Explain why one of these responses will not work if the relative humidity is extremely high.
- In endotherms, what controls the balance between the amount of heat lost and the amount gained?The following are the energy reserves of the body: bloodglucose, liver glycogen, muscle glycogen, adipose fat, andmuscle protein. Comment on their importance in the body’senergy economy, their calorie content, and their relativelevels in an average bodyEndotherms can regulate how much heat is gained or lost between the environment and their bodies via 4 different mechanisms/processes. List and describe these mechanisms.
- He reasons that a liter (about a quart) of water weighs 1000 g, whichis equivalent to 580,000 cal, or 580 kcal, of heat when lost as sweat.Therefore, instead of reducing his diet by 580 kcal/day, he believesthat losing a liter of sweat every day in the sauna will cause him tolose about a pound of fat a week. Will this approach work? Explain.Thermoregulation is a process used to maintain body temperature within an optimum range. Describe how the human body maintains body temperature in both hot and cold weather ensuring you explain the mechanisms that are involved.When you jog, most of the food energy you burn above your basal metabolic rate (BMR) ends up as internal energy that would raise your body temperature if it were not eliminated. The evaporation of perspiration is the primary mechanism for eliminating this energy. Determine the amount of water you lose to evaporation when running for 32 minutes at a rate that uses 400 kcal/h above your BMR. (That amount is often considered to be the "maximum fat-burning" energy output. The latent heat of vaporization of water at room temperature is 2.5 106 J/kg.)The metabolism of 1 gram of fat generates approximately 8.65 kcal of energy and produces approximately 1 gram of water. (The hydrogen atoms in the fat molecule are transferred to oxygen to form water.) What fraction of your need for water will be provided by fat metabolism?