Felipe is practicing lifting weights. He picks up a 30-pound weight, and his forearm moves steadily downward as he struggles to hold it. Luckily, biology takes over and his arm eventually pulls the weight up. What process is at work here?
A. Monosynaptic stretch reflexes caused the counteracting muscle firing to take place.
B. Beta motor neurons sent a message to Felipe's arm to flex his muscle.
C. Polysynaptic reflexes energized contractions in Felipe's upper body.
D. The reticular formation relayed messages from the arm to the prefrontal cortex.
Answer: A
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Maccoby and Jacklin (1974) found that girls are more likely to comply with the directions of adults than boys, and they are more readily influenced by others than boys are. One explanation your authors offer for these findings is that
a. girls are genetically more docile and conforming than boys b. girls are more empathetic than boys, so they don't want to hurt feelings by disagreeing. c. girls are trained by their mothers to be "agreeable," while boys are trained by their fathers to be "confrontational.". d. girls value harmony and don't want people to start arguing.
Jan took several prescription drugs early in her pregnancy before she had missed her menstrual period. What advice will the doctor likely give to Jan?
Have an abortion because the embryo will certainly have severe birth defects. Since the placenta had begun to develop, it is not likely that the drugs caused any harm. Many prescription drugs are harmless in low doses, but the doctor would want to know specific information about the drugs. It is highly unusual for prescription drugs to have any effect this early in the pregnancy.
____________motives reflect a desire to understand or overcome a challenge for its own sake
FIll in the blank with correct word.
Of the following, which is used in order to create a 2½-D sketch under Marr’s theory of vision?
a. texture b. shading c. edges d. all of these