What is the relationship between glucocorticoids and testosterone in the reproductive behavior of frogs?
What will be an ideal response?
Answer: Calling mediated by testosterone, is one of the most energetically costly behaviors observed in ectotherms, necessitating the mobilization of energy stores by glucocorticoids. Elevated levels of testosterone result in more calling, increasing the demand for energy and the titers of glucocorticoids. Ultimately, the glucocorticoid levels are so high that the stress response is elicited, testosterone production declines, and calling ceases.
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The simple columnar epithelium that form absorptive cells of the digestive tract have which characteristic?
a. cilia b. fibroblasts c. a rich vascular supply d. dense microvilli
A bone shaft is the diaphysis; the expanded parts at the ends are the epiphyses
Indicate whether the statement is true or false
Name the muscles involved in flexing the toes
A) extensor digitorum longus and extensor hallucis longus B) flexor digitorum longus and flexor hallucis longus C) tibialis anterior, fibularis tertius, extensor digitorum longus, extensor hallucis longus D) gastrocnemius, fibularis brevis, fibularis longus, plantaris, soleus, tibialis posterior E) plantaris, soleus, flexor digitorum longus, flexor hallucis longus
Waves of muscular contractions that propel the contents of the digestive tract are called
A) segmentations. B) pendular movements. C) peristalsis. D) churning movements. E) mastication.