Question

question 8 (1 point) saved
constriction of the blood vessels to the hands and feet is most likely a response to...

increasing body temperature
hyperthermia
decreasing body temperature
increasing blood glucose concentration
decreasing blood glucose concentration

question 9 (1 point)
which property enables mammals to maintain a relatively constant body temperature?

positive feedback system
antagonistic hormones
ability to prevent a dynamic equilibrium
goosebumps
negative feedback system

Explanation:

• Question 8: When the body temperature is decreasing, the body tries to conserve heat. Constricting blood vessels to the hands and feet (peripheral vasoconstriction) reduces heat loss from these extremities. Increasing body temperature or hyperthermia would likely lead to vasodilation to dissipate heat. Blood glucose concentration changes are more related to metabolic energy supply (e.g., for muscle contraction) rather than direct temperature - related vasomotor responses.
• Question 9: Negative feedback systems are crucial for maintaining homeostasis, including a relatively constant body temperature. In thermoregulation, when the body temperature deviates from the set point (e.g., gets too high or too low), negative feedback mechanisms (such as sweating to cool down or shivering to generate heat) are activated to bring the temperature back to the normal range. Positive feedback systems amplify a change (e.g., in blood clotting or childbirth), which is not suitable for maintaining a constant state. Antagonistic hormones (like insulin and glucagon for glucose regulation) are more about regulating a specific substance (not overall body temperature regulation in the context of this question). Goosebumps are a minor part of the thermoregulatory response (related to trapping a layer of air for insulation in some mammals, but not the main property for maintaining constant temperature). The ability to prevent a dynamic equilibrium is incorrect as homeostasis is a form of dynamic equilibrium.

Answer:

• Question 8: decreasing body temperature
• Question 9: negative feedback system