A new drug apparently increases short-term memory. Students were divided randomly into two groups at the beginning of the semester
One group was given the memory pill once a day for the semester, and the other group was given a same-looking pill, but it was just sugar. The sugar pill is termed a(n) ________.
A) placebo
B) effective dose
C) controlled pill
D) variable
E) treatment pill
A
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Instead of using its own lungs, the fetus obtains oxygen and nutrients from the mother's blood.?
Indicate whether the statement is true or false
Astrocytes help maintain the CNS extracellular milieu by:
A. taking up and redistributing excess K+ and other ions B. wrapping extensions of their cytoplasm around axons C. phagocytosing damaged CNS neurons D. lining the ventricular surface of the CNS E. differentiating into neurons in response to injury
The conversion between different states of energy (e.g. potential energy to kinetic energy)
A. is not 100% efficient. B. typically generates heat. C. is not 100% efficient and typically generates heat. D. is 100% efficient. E. is not possible; energy cannot change its state.