Scientists at NIH are making progress in using stem-cells to cure
a. Parkinson’s disease.
b. type 2 diabetes.
c. sickle-cell anemia.
d. bipolar disorder.
e. anorexia.
C
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A response to change in the internal/external environment that adds to the change is called
a. positive feedback. b. physiological feedback. c. reflex feedback. d. negative feedback. e. anatomical feedback.
Which specialization evolved in land plants to allow for reproduction in dry conditions?
a. xylem b. phloem c. stomata d. roots e. sporophyte dominance
Cytological examination of resting and contracted muscle provides important support for the sliding filaments model for how skeletal muscle contracts. This evidence includes the observation that during contraction the
A) Z lines move farther apart. B) lengths of the thick filaments shorten significantly. C) lengths of the thin filaments shorten significantly. D) I bands get longer. E) H zone becomes narrower.
In the process of inflammation, the vasodilation is the result of Mast Cells degranulation
a. true b. false