All of the following are characteristics of acquired immunity EXCEPT __________.
A) adaptive immunity.
B) nonspecific immunity.
C) humoral immunity.
D) cell-mediated immunity.
B) nonspecific immunity.
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During concentric isotonic contraction of a skeletal muscle fiber, which of these occurs?
A. Thin filaments shorten B. Sarcomeres lengthen C. A bands lengthen D. I bands shorten E. A bands shorten
The largest folds in the small intestine are the __________.
a) villi b) haustra c) circular folds (plicae circulares) d) microvilli
During an action potential in muscle, ________
A) both Na+ and K+ diffuse into the cell B) K+ diffuses into the cell, then Na+ diffuses out C) Na+ diffuses into the cell, then K+ diffuses out D) both Na+ and K+ diffuse out of the cell
In a negative feedback mechanism, the response of the effector
A. reverses the original stimulus. B. enhances the original stimulus. C. has no effect on the original stimulus. D. is usually damaging to the body. E. creates a cycle that leads away from homeostasis.