How does an organism's body determine whether to utilize short-term or long-term strategies for maintaining homeostasis?
What will be an ideal response?
Answer:
It always costs energy to maintain an internal environment that may differ from the external environment. The key question is cost versus benefit. If the difference will last a long time, it will be beneficial to invest more resources early on, which will allow the organism to maintain other functions (e.g. growing fur in winter). On the other hand, if it is a short-term difference (e.g. hot sun at noon), then less expensive measures may be more appropriate.
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In the presence of aldosterone, which nephron region reabsorbs the greatest fraction of the filtered Na+?
A. Distal convoluted tubule B. Cortical collecting duct C. Proximal tubule D. Descending limb of the loop of Henle E. Macula densa
Primary motivated behavior is behavior that is based on changes or anticipated changes in the internal environment
Indicate whether the statement is true or false.
The hormone that seems to influence how fat is metabolized in the body is:
a. leptin b. ANH c. ADH d. melatonin
Which of the following is an example of a sympathetic effect?
A) bronchoconstriction B) stimulation of muscle of urinary bladder C) serous salivary secretion D) ciliary muscle relaxation for far vision