Lizards also thermoregulate and, as in humans, thermoregulation in lizards involves negative feedback. lizards, however, are ectotherms and gain most of their heat from external sources. therefore, they often use behavioral mechanisms to adjust their body temperature. for example, if a lizard's body temperature drops below its normal range, the lizard may seek a sunny resting spot to warm up. what are the stimulus and the response in this example?

Mr. j, age 42, is a construction worker in las vegas. he recently noticed that a mole on his face seemed to be getting larger and darker. at first he did not worry because he was in the sun a lot and assumed the change may have been caused by sunburn. after a month, not only was the mole larger and darker, but it appeared to be “bumpy.” his doctor diagnosed a malignant melanoma skin cancer following biopsy of the nevus. mr. j reports pain in his right shin that does not go away when he puts his feet up or sleeps. discussion questions 1. relate mr. j’s skin changes to the warning signs for malignant melanoma. (see malignant melanoma.) 2. discuss the normal progression of this malignancy. what is the significance of the bone pain that mr. j is experiencing? (see malignant melanoma.) 3. discuss the treatment available for this patient and the prognosis for recovery. (see malignant melanoma.)