Compare the hormonal effects of norepinephrine with its function as a neurotransmitter. How do these effects reinforce each other to help an individual survive?
What will be an ideal response?
In both cases, norepinephrine gears an organism up for a burst of activity. The release as a hormone has general effects on physiology, including raising blood sugar, blood pressure, and heart rate. The sympathetic autonomic nervous system also releases norepinephrine as a neurotransmitter, which increases heart rate, depresses digestive activity, and acts on other organs in preparation for "fight or flight." This coordinates an increase in the capacity to act quickly, which may allow an organism to escape disaster.
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A primary carnivore is indicated by
a. A. b. B. c. C. d. D. e. E.
Adaptation to oxygen concentration
What will be an ideal response?
When a protist possesses two flagella, both are generally used for propulsion. Assuming that a flagellum containing a crystalline rod cannot undulate back and forth, and assuming that two undulatory flagella can produce more effective locomotion than can a single flagellum, which of these organisms should have the least effective locomotion?
a. golden algae b. dinoflagellates c. Euglenids d. Chlamydomonas e. oomycetes
Which ecosystem service is most closely related to the process of eutrophication?
A. habitat B. pollination C. recreation D. genetic resources E. nutrient cycling