Compare the three types of muscle tissue. List three similarities and three differences among them
Similarities: All have contractile proteins; skeletal and cardiac have striations; cardiac and smooth are involuntary; cardiac and smooth are uninucleate.
Differences: Skeletal is voluntary; cardiac has intercalated discs; smooth is nonstriated; skeletal is multinucleate.
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Which group of muscles forms a thick, fleshy mass at the base of the thumb?
A. Hypothenar group B. Thenar group C. Midpalmar group D. Dorsal interossei group E. Abductor digit group
Olfactory receptors are very special because they
A) lack structural differences. B) can distinguish at least fifty primary smells. C) can distinguish from among thousands of chemical stimuli. D) contains receptor populations with different sensitivities. E) are a rare example of neuronal replacement.
During depolarization of the plasma membrane,
A. Na+ moves rapidly out of the cell. B. Na+ moves rapidly into the cell. C. membrane permeability to Na+ decreases. D. K+ moves rapidly out of the cell. E. the outside of the cell becomes positively charged relative to the inside.
What is the normal, programmed death of cells that have completed their function called?
A. Autophagy B. Apoptosis C. Atrophy D. Necrosis E. Hypoplasia