What is leptin and what role does it play in the biology of body weight?
What will be an ideal response?
Answer: A good answer will include the following key points.
• Leptin is a protein produced by fat cells.
• Leptin travels through the bloodstream to the hypothalamus.
• When leptin levels are normal, people eat just enough to maintain their weight.
• If leptin levels are high (because of more fat), appetite is decreased, metabolic rate increases, and the organism becomes more active.
• If leptin levels are low (because of reduced weight), appetite increases and metabolic rate drops.
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Research on the brain sizes of various animals has indicated that brain size is MOST strongly linked to a species' ____
a. complexity of social structures b. emotional intelligence c. lifespan d. empathy
Which of the following provides the best evidence that reinforcers do not simply strengthen behavior?
a. guinea pigs learned to turn their heads in a different direction when the behavior-reinforcercontingency was changed b. cats made fewer errors after repeated escapes from a problem box c. rats trained with bran mash made more errors in a maze when their reinforcer was switched to sunflower seeds d. pigeons will peck at a key even when doing so results in a loss of food
The idea that whatever time children devote to electronic media reduces time spent in educational activities is the ______
Fill in the blank with correct word
The longest phase of prenatal development is the period of
a. the embryo. c. the fetus. b. viability. d. the zygote.