Most of the protein eaten by the mother during the third trimester is used for the development of the
____________________ system. Fill in the blank(s) with the appropriate word(s).
ANS: nervous
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The critical tissue for producing a vasodilatory effect of acetylcholine in Robert Furchgott's experiments with rabbit aortas was the
A. endothelium. B. smooth muscle layer. C. elastic outer layer. D. pericardium. E. one-way valves.
In the late 1920s, a mutation occurred in many silver fox farms around the world. The fox farms that sold expensive
furs were proud of the quality of their furs, and each advertised that it had the best, purest breed of all the fox farms. The new mutations produced a "platinum" coat pattern that was commercially desirable, so the farms crossed them to get more. The results of their breeding experiments were as follows: (1) silver ´ silver >>> all silver offspring; (2) silver ´ platinum >>> equal numbers of silver and platinum; (3) platinum ´ platinum >>> two platinum for each silver offspring. Explain. What will be an ideal response?
When the oxygen level in the blood is low, which of the following secretes erythropoietin, causing an
increase in red blood cell production? a. lungs b. kidneys c. liver d. spleen e. pancreas
When two excitatory postsynaptic potentials (EPSPs) occur at a single synapse so rapidly in succession that the postsynaptic neuron's membrane potential has not returned to the resting potential before the second EPSP arrives, the EPSPs add together
producing _____. A) temporal summation B) spatial summation C) tetanus D) the refractory state