The motor (somatic nervous) system can alter the activities of its targets, the skeletal muscle fibers, because _____
A) it is electrically coupled by gap junctions to the muscles
B) its signals bind to receptor proteins on the muscles
C) its signals reach the muscles via the blood
D) it is connected to the internal neural network of the muscles
B
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Histamine causes all of the following except
A. pruritis and headache. B. constriction of smooth muscle of bronchi and the intestine. C. wheal and flare reaction in skin. D. relaxation of vascular smooth muscle. E. increased sensitivity to pain.
Select the best response to the question. Why are prions a concern for health care providers?
A) Large numbers of new prion-related diseases are diagnosed each year. B)Prion-related diseases require multiple medications for successful treatment. C)Prions are resistant to a number of routine sterilization techniques. D) Prion-related diseases cause severe cardiopulmonary (heart)-related signs and symptoms.
Suppose you are testing a treatment for AIDS patients and find that 75% respond well, whereas 25% show no improvement or a decline in health. You should
A) conclude that only 75% of AIDS patients should be treated. B) begin work on developing a new drug. C) conclude that you have proven the effectiveness of the drug. D) review the results, modify the drug or the dosage, and repeat the experiment. E) discontinue experimentation with this treatment because 25% of patients did not improve.
Which of the following is not a potential outcome of a gene duplication?
A) they may result in gene redundancy B) they may result in providing the raw material for evolution C) they may lead to the development of gene families D) they may produce phenotypic variation E) they may lead to translocation cross formation during synapsis