A weightlifter uses muscles so the muscles exert more than 75% of their maximum tension. This stimulates
A. shrinking of skeletal muscle.
B. conversion of skeletal to smooth muscle.
C. an increase in slow, fatigable white fibers.
D. muscle fibers developing new filaments of actin and myosin.
Answer: D
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Movement that brings the foot farther from the shin is a
A. plantar flexion. B. dorsiflexion. C. rotation. D. hyperextension.
Which of the following subatomic particles has a neutral charge?
a) neutron b) electron c) proton d) Both neutron and electron. e) All of these choices.
If an individual carries two different alleles of the same gene, he or she is ________ for the trait determined by that gene.
A) homologous B) homozygous C) heterozygous D) autosomal E) polygenic
Chemoreceptors located in the carotid bodies and aortic arch sense minute changes in the ______ and send signals to the respiratory centers via the _______________ nerves.
A) PaO2, vagus and intercostal B) PaCO2, glossopharyngeal and vagus C) PaCO2, phrenic and glossopharyngeal D) PaO2, hypoglossal, vagus, and intercostal