Muscle fibers contract when Z lines move _________ and the sarcomeres _________.
A. farther apart; stretch
B. farther apart; shorten
C. closer together; stretch
D. closer together; shorten
Answer: D
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a. True b. False Indicate whether the statement is true or false
In tests of self-concept, approximately how old are infants before they can recognize themselves in a mirror as distinct from another child?
a. Approximately 5 months old b. Approximately 1 year old c. Approximately 1.5 years old d. Approximately 2 years old
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Indicate whether the statement is true or false.
Paul is poor, obese, a smoker, and sedentary. His cousin Mike is middle-class, lean, a non-smoker, and an "exercise nut." Compared to Paul's body, Mike's body is likely to be producing __________free radicals and to manifest __________ telomere shortening
A) fewer; slower B) fewer; accelerated C) more; accelerated D) more; slower