Shivering is used by mammals to increase body heat when the hypothalamus detects a body temperature below the set point. Although the behavior involves muscles, the outcome is not movement but "wasted" energy in the form of heat. This is an example of nature reusing a body structure for an additional purpose.If the boys progressed into full-blown hypothermia, this would be a failure of which regulatory system?
A. temperature homeostasis
B. glucose homeostasis
C. endodermic regulation
D. ectothermic regulation
Answer: A
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ACTH stands for adrenocorticotropic hormone, but it is produced in the anterior pituitary. What is the basis of this name?
A. It is expressed most highly in tropical climates. B. It stimulates the adrenal cortex. C. It signals to the kidneys to reabsorb water. D. It stimulates appetite by acting on the cerebral cortex.
All blood from small intestine capillaries flow
through the ___ to the liver.
a. renal vein b. renal artery c. hepatic portal vein d. hepatic portal artery e. bile duct
It is proposed that Cro-Magnons were responsible for the extinction of many large mammals during the Pleistocene epoch. How could this feat have been accomplished?
A. Cro-Magnon man was the first species of hominids to hunt in groups. This would have increased their chance of killing larger animals. B. Cro-Magnon man was the first species of hominid to use fire. This would have increased their success during hunting. C. Cro-Magnon man was the most efficient bipedal species. They would have been able to run after prey species more efficiently than any of their predecessors. D. Cro-Magnon man had an increase in tool technology that enabled them to kill animals from a distance.
In California, a species of salamanders were geographically separated over time. The group that lived in southern California relied heavily on large gold blotches on their skin that helped to camouflage them from predators. The group that lived along the coast adopted a color pattern that mimicked a poisonous, colorful newt common to that area. Instead of being camouflaged, these salamanders advertised their colors. What type of selection process has occurred over time?
A. theoretical selection B. natural selection C. experimental selection D. artificial selection