Describe the major features of fast- and slow-twitch muscles, and discuss the implications of these different features for movement.
What will be an ideal response?
In humans, the thick myosin filaments in muscle fibers come in three varieties. Type I fibers are known as slow-twitch fibers, and Types IIa and IIb are known as fast-twitch fibers. Type IIa fibers are also known as fast-twitch, fatigue-resistant fibers, while Type IIb are also known as fast-twitch, fatigable fibers. Type IIb fibers can contract up to 10 times faster than Type I fibers. The contraction velocity of Type IIa fibers falls somewhere between Type I and Type IIb. Most skeletal muscles contain mixtures of all three types of fibers but in different proportions. The postural muscles of the back, neck, and legs are dominated by slow-twitch fibers. The muscles of the arms and shoulders contain higher proportions of fast-twitch fibers.
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If given some weights and asked to balance a scale by hooking the weights onto the scale's arms, how will the most cognitively advanced adolescents determine where to place the weights to balance the scale? How about preadolescents?
What will be an ideal response?
In 1954, the American Psychological Association (APA) published recommendations that suggested a new method for establishing validity in which the researcher provides evidence that the test measures behavior predicted by a psychological theory. What did the APA call this evidence?
a. CConstruct validity b. FFactor analysis c. MMulti-trait, multi-method analysis d. GGeneralizability
To say that attachment is synchronous means that it develops at the proper time in the developmental sequence of events
Indicate whether the statement is true or false
Erika is playing with a puzzle, and she is having difficulty figuring out where the last few pieces should go. She struggles more and more, and eventually starts to get very angry. When her sister Donna tries to help her, Erika asks her to stop helping. When Donna tries to help again, Erika pushes Donna hard and she falls to the ground, hurting her arm. Which type of aggression has Erika demonstrated?
A. Hostile aggression B. Instrumental aggression C. Social aggression D. Passive aggression