To describe:
The term “positive feedback”. Also, determine whether it is always harmful and how often does it occur naturally.
Concept introduction:
There are two types of feedback mechanisms in the body. One is positive feedback and the other is negative feedback. Both these feedback mechanisms are exactly opposite to each other and are useful for the body.
To determine:
Whether positive feedback is always harmful.
Concept introduction:
There are two types of feedback mechanisms in the body. One is positive feedback and the other is negative feedback. Both these feedback mechanisms are exactly opposite to each other and are useful for the body.
To determine:
The way how often does positive feedback naturally occur.
Concept introduction:
There are two types of feedback mechanisms in the body. One is positive feedback and the other is negative feedback. Both these feedback mechanisms are exactly opposite to each other and are useful for the body.
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Biology
- Heat exchange with the environment depends on the surface area-to-volume ratio of the body. Assuming that the body shape of an animal is at least somewhat spherical, a considerable decrease in body size would the surface area-to-volume ratio, and the ability to exchange heat with the environment would A. increase; increase B. increase; stay about the same C. increase; decrease D. decrease; increase E. decrease; stay about the samearrow_forwardDuring exercise in a hot and humid environment, the inability of the body to lose excess heat through evaporation increases: Group of answer choices Core temperature Risk of heat injury or heat illness Risk of dehydration Sweat rate All of the abovearrow_forwardIn mammals, body temperature is controlled by a structure in the brain called the hypothalamus. The hypothalamus is able to sense even slight variations in body temperature. This structure is responsible for bodily responses that include thirst, the activation of sweat glands, and the dilation of blood vessels near the skin. Each of these mechanisms works to restore body temperature to a normal range.arrow_forward
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- Temperature and wind combine to cause heat loss. Hypothermia occurs when the body temperature falls more than 4 degrees F below normal. Death can occur if hypothermia persists for over 3 hours. According to the chart, in which of the following temperature and wind combinations would the body temperature be the lowest and a person most at risk for developing hypothermia?arrow_forwardEndotherms 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.arrow_forwardSome animals, such as penguins, huddle together in groups to stay warm. This is an example of which key adaptation to balance heat? Group of answer choices Evaporative cooling Circulatory adaptation Behavioral responses Metabolic heat productionarrow_forward
- True or False? Excessive body water losses via sweating during exercise can lead to decreases in body temperature.arrow_forwardThe rate of heat loss when a person is submerged in cold water because water has much greater thermal conductivity than air at the same temperature. Decreases Stays the same Increases None of the abovearrow_forwardCHOOSE ALL THAT APPLY: Which of the following animals use countercurrent heat exchange to maintain elevated body temperatures? Arctic animals like arctic fox Large tropical lizards, like komodo dragons Whales, dolphins and other cetaceans Predatory fish like tuna and sharksarrow_forward
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning