Which of the following statements about the digestive system is false?
a) Chyme is a mixture of food and digestive juices that is produced in the stomach.
b) Food enters the large intestine before the small intestine.
c) In the small intestine, chyme mixes with bile, which emulsifies fats.
d) The stomach is separated from the small intestine by the pyloric sphincter.
Ans: b) Food enters the large intestine before the small intestine.
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Assess the merits of each action potential analogy; select the representation that corresponds most accurately.
A. An action potential happens like a ripple in a pond; a ripple spreads out and gets slightly weaker as it travels. B. An action potential happens like a row of dominoes falling; the signal has constant velocity and constant strength no matter how long the row of dominoes may be. C. An action potential happens like a crowd doing the wave in a football stadium; the enthusiasm and volume increase as more people get involved.
The new version of the H1N1 virus had genes
from ___ flu viruses.
a. human b. bird c. swine d. all of these e. none of these
Which part of the inflammatory response walls off the injured site, preventing the spread of the damage?
a. vasodilation b. leakage of clotting factors out of the blood c. edema d. fever e. increased blood flow
Compare the sympathetic nervous system with the parasympathetic nervous system.
What will be an ideal response?