Resistance
a. is a measure of the hindrance to blood flow through a vessel caused by friction between the moving fluid and stationary vascular walls
b. is doubled when the radius of the vessel is reduced by one-half
c. increases 16-fold when the radius of the vessel is reduced by one-half
d. is both a and b
e. is both a and c
E
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Which of the following is not a facial bone?
A. The palatine bone B. The lacrimal bone C. The ethmoid bone D. The vomer E. The maxilla
The statement "Its postganglionic axons always use acetylcholine as the neurotransmitter" is
A) true only for the parasympathetic nervous system. B) true only for the sympathetic nervous system. C) true for both the parasympathetic and sympathetic nervous systems. D) not true for either the parasympathetic or sympathetic nervous systems. E) true only for the somatic nervous system.
What is transcription?
A) Making an identical copy of the DNA strand. B) Making an RNA strand from the DNA template. C) Making a DNA strand from the RNA template. D) Taking the mRNA sequence and producing a protein. E) Taking the cDNA sequence and producing a protein.
The blood-brain barrier
A. does not prevent fluctuations in the composition of the blood from affecting the functions of the brain. B. prohibits the removal of waste materials from the neurons. C. protects neurons from toxic substances in the blood. D. prohibits the transport of amino acids and glucose to the neurons. E. permits passage of foreign substances from the blood to the neurons.