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Related Concept Videos

Decreased Body Temperature01:29

Decreased Body Temperature

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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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Decreased pulse rate01:14

Decreased pulse rate

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Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with...
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Types of Hypothesis Testing01:11

Types of Hypothesis Testing

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There are three types of hypothesis tests: right-tailed, left-tailed, and two-tailed.
When the null and alternative hypotheses are stated, it is observed that the null hypothesis is a neutral statement against which the alternative hypothesis is tested. The alternative hypothesis is a claim that instead has a certain direction. If the null hypothesis claims that p = 0.5, the alternative hypothesis would be an opposing statement to this and can be put either p > 0.5, p < 0.5, or p...
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Errors In Hypothesis Tests01:14

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When performing a hypothesis test, there are four possible outcomes depending on the actual truth (or falseness) of the null hypothesis and the decision to reject or not.
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Increased Body Temperature01:25

Increased Body Temperature

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A body temperature above  38°C  (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in...
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Increased pulse rate01:17

Increased pulse rate

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Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
Many factors can elevate the risk of developing tachycardia. These include advanced age, a family history of arrhythmias, and an...
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Related Experiment Video

Updated: Feb 2, 2026

Identification of Critical Conditions for Immunostaining in the Pea Aphid Embryos: Increasing Tissue Permeability and Decreasing Background Staining
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Testing the heat dissipation limitation hypothesis: basal metabolic rates of endotherms decrease with increasing

Imran Khaliq1,2,3, Christian Hof2,4

  • 1Department of Zoology, Ghazi University, Pakistan, Dera Ghazi Khan, Punjab, Pakistan.

Peerj
|November 8, 2018
PubMed
Summary

Basal metabolic rates (BMR) in endotherms are linked to their metabolic critical temperatures. This study confirms that higher critical temperatures correlate with lower BMR, supporting the heat dissipation limit theory.

Keywords:
BMRBirdsEndogenous heat loadEnergyMacrophysiologyMammalsMetabolic critical temperatures

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Area of Science:

  • Physiology
  • Ecology
  • Climate Change Biology

Background:

  • Metabolic critical temperatures delineate the ambient temperature range for minimal thermogenesis in endotherms.
  • Understanding the interplay between metabolic critical temperatures and basal metabolic rates (BMR) is crucial for predicting animal responses to climate change.

Purpose of the Study:

  • To test the heat dissipation limit (HDL) theory by examining the relationship between metabolic critical temperatures and BMR in endotherms.
  • To determine if BMR is lower at higher metabolic critical temperatures, as predicted by the HDL theory.

Main Methods:

  • Analysis of a large dataset comprising 146 endotherm species.
  • Regression analyses were employed to investigate the relationship between BMR and upper/lower critical temperatures.
  • Phylogenetic relationships and body mass were carefully accounted for in the analyses.

Main Results:

  • A significant negative relationship was found between metabolic critical temperatures and BMR in both birds and mammals.
  • The findings support the HDL theory's prediction that BMR is inversely related to metabolic critical temperatures.
  • Metabolic critical temperatures and BMR were shown to respond congruently to ambient climatic conditions.

Conclusions:

  • The heat dissipation capacity of endotherms is a key factor influencing their basal metabolic rates.
  • The results highlight the importance of considering heat dissipation limits when assessing species' vulnerability to climate change.
  • Metabolic critical temperatures and basal metabolic rates are interconnected, influencing how endotherms cope with environmental temperatures.