3 Boardworks AP Biology Controlling Body Temperature Heat transferBoardworks AP BiologyControlling Body Temperature
4 How is heat gained and lost? Boardworks AP BiologyControlling Body TemperatureTeacher notesStudents could be asked which source of heat is most important to the iguana in the picture. How do they think this would change if the lizard were replaced with a bird?
8 The importance of the skin Boardworks AP BiologyControlling Body Temperature
9 Thermoregulation in humans Boardworks AP BiologyControlling Body TemperatureTeacher notesThis animation demonstrates how body temperature is controlled in humans, highlighting the role of negative feedback in the process. It is important to note that humans also maintain their internal body temperature by varying their metabolic rate like other endotherms. Similarly, not all of the mechanisms used by humans are seen in all endotherms. Sweating is a prime example of this. Many mammals do not sweat to cool down, as the loss of water is far too costly to their metabolism.
10 Hyperthermia and hypothermia Boardworks AP BiologyControlling Body TemperatureProlonged exposure to high temperatures can lead to hyperthermia. The body’s core temperature rises above 41°C, causing its thermoregulatory mechanisms to break down.When this happens, positive feedback occurs and the person’s body temperature can spiral out of control. A core body temperature of 43°C and higher usually causes death.If the body’s core temperature falls below 35°C a person may suffer from hypothermia. Again, the body’s thermoregulatory mechanisms fail and positive feedback occurs, leading to a further decrease in temperature.
11 Physiological thermoregulation Boardworks AP BiologyControlling Body Temperature
12 Thermoregulatory control system Boardworks AP BiologyControlling Body Temperature
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