Whales are air-breathing aquatic mammals, and some species can remain underwater for long periods of time. Which type of skeletal muscle fibers are most likely dominant in these deep diving whales?
A. Fast (IIb) fibers
B. Fast (type IIa) fibers
C. White fibers
D. Slow fibers
Answer: D
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Embryonic stem cells growing in a lab dish are bathed in a "cocktail" of chemicals that cause them to specialize into branching networks of single-nucleated cells that pulsate in unison. This tissue is most likely
A. epithelial tissue. B. cardiac muscle. C. skeletal muscle. D. smooth muscle.
Which one of the following is not involved in sending the vibrational signal to the inner ear?
a. external auditory meatus b. eustachian tube c. malleus d. stapes e. tympanum
Diffusion rate is fastest when the concentration gradient is
A. steepest and temperature is at body temperature. B. steepest and temperature is highest. C. slightest and temperature is at body temperature. D. slightest and temperature is lowest. E. slightest and temperature is highest.
The appendicular skeleton consists of the
A. skull and appendages. B. vertebral column. C. rib cage and the pelvis. D. rib cage and limb girdles. E. limbs and their girdles.