Which of the following happens during a fight or flight response?
a) The parasympathetic dominates
b) Blood flow to heart enhanced by beta-1 receptors on blood vessels to heart binding epi
c) Heart function increased by beta-2 receptors in heart binding epi
d) Both a and c occur
e) None of the above occur
Answer: e) None of the above occur
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Answer the following statement true (T) or false (F)
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Answer the following statement true (T) or false (F)
The two broad classes of cells in the nervous system include 1. those responsible for information processing, and 2. those providing mechanical and metabolic support.These two categories of specialized cells are called
A. microglia and Schwann cells. B. Schwann cells and glial cells. C. neurons and glial cells. D. neurons and fibrocytes. E. astrocytes and Schwann cells.
What is an area of the Earth's surface currently undergoing primary succession?
A. Shallow seas with low productivity B. Volcanoes in Iceland C. Redwood forests along the northwestern U.S. coast D. Old orange groves in Florida