Muscles exhibit the property of excitability. This means that the muscle
A. excites itself.
B. responds to stimulation by the nervous system.
C. stretches beyond its normal length.
D. recoils to its original resting length.
E. shortens its length.
Answer: B
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Indicate whether this statement is true or false.
These proteins are released by infected cells and help protect surrounding uninfected cells.
A. Complement B. Defensins C. Interferons D. Prostaglandins
Which germ layer is tooth enamel derived from?
A. ectoderm B. mesoderm C. endoderm