If you need to design a drug to cross the plasma membrane of the blood-brain barrier cells quickly, where would you start?
A. With a large uncharged molecule
B. With a small charged molecule
C. With a lipid-soluble molecule
D. With a water-soluble molecule
Answer: C
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Lymph nodes:
a. have one afferent vessel b. have several efferent vessels c. contain phagocytic cells d. all of the above
The muscularis of the bladder is composed of three layers of smooth muscle called the __________________ muscle.
Fill in the blank(s) with the appropriate word(s).
List the important features of the ECG, and indicate what each represents
A) P wave (atrial repolarization), QRS complex (ventricular depolarization), T wave (ventricular repolarization)
B) P wave (atrial repolarization), QRS complex (ventricular depolarization), T wave (atrial depolarization)
C) P wave (atrial depolarization), QRS complex (ventricular depolarization), T wave (ventricular repolarization)
D) P wave (atrial depolarization), QRS complex (ventricular depolarization), T wave (atrial depolarization of the next cycle)
E) P wave (atrial contraction), QRS complex (ventricular contraction), T wave (ventricular relaxation)
Summation
A) is caused by combining two or more local potentials. B) occurs at the trigger zone of the postsynaptic neuron. C) results in an action potential if it reaches the threshold potential. D) can occur when two action potentials arrive in close succession at a single presynaptic terminal. E) all of the above.