Which of the following would increase the rate of heat exchange between an animal and its environment?   feathers or fur wind blowing across the body surface vasoconstriction blubber or fat layer please help    A researcher is setting up an experiment to measure basal metabolic rate in prairie voles (Microtus ochrogastera small rodent). Which of the following would be the best set of conditions for the voles immediately before and during the measurement?   House the animals in a cage with plenty of food and water to avoid stress; conduct measurements in a warmer room than the room where housed. House the animals in a cage with no food for a few hours before measurement; conduct measurements in a room the same temperature as the room where housed. House the animals in a cage with plenty of food and water to avoid stress; conduct measurements in a room the same temperature as the room where housed. House the animals in a cage with no food for a few hours before measurement; conduct measurements in a colder room than the room where housed, and exercise the voles.

The long-term stability of weight is often considered a marker of energy balance. According to Hall et al., why does weight change in the short term not necessarily represent energy imbalance?       Changes in body weight include changes in body water, which may be variable     Rapid turnover of fat stores can lead to short term changes in body weight       Variations in energy stored per unit of body weight exist       All of the above

The graph shows the blood-glucose levels and insulin levels of an individual.   Blood-glucose levels are controlled by a feedback loop that involves the hormone insulin. Which of the following statements best explains the role of insulin in this feedback loop? Insulin controls the blood-glucose level in a positive feedback loop. As the level of blood glucose rises above a normal set point, the level of insulin increases to raise the blood-glucose level even higher. Insulin controls the blood-glucose level in a negative feedback loop. As the level of blood glucose rises above a normal set point, the level of insulin increases to raise the blood-glucose level even higher. Insulin controls the blood-glucose level in a positive feedback loop. As the level of blood glucose rises above a normal set point, the level of insulin increases to lower blood-glucose back to the normal level. Insulin controls the blood-glucose level in a negative feedback loop. As the level of blood glucose…

Suppose that a cow is launched into space, far from the Sun, wearing a suit that provides it with oxygen but very little insulation. Estimate how long it will take the cow to radiate enough heat to lower its body temperature by 2C , wherein hypothermia will begin to set in. (Note: You will have to estimate whatever numerical parameters that you think are relevant to this problem; there is a wide range of “correct answers”.)