The function of the ventricular conduction system of the heart is to
a. spread the action potential throughout the ventricle to ensure a single, coordinated contraction of the both ventricles
b. spread the action potential in the absence of sympathetic stimulation
c. spread the action potential throughout the atria and ventricles
d. slow down the original action potential so it has time to spread through the ventricles evenly
e. perform both a and d
A
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The condition in which the lens of the eye becomes cloudy is called:
a. a cataract b. presbyopia c. glaucoma d. pink eye
Receptor sites on the outer surface of the plasma membrane are
a. ATP. b. carbohydrates. c. cyclic AMP. d. DNA. e. proteins.
A solution containing proteins of a particular type is exposed to the same concentrations of ligands X and Y, but the percent saturation of molecule X is greater than the percent saturation of molecule Y. Which is most likely to be a true statement?
A. The binding sites for ligand X are 100% saturated. B. The binding sites for ligand X have greater specificity than the binding site for ligand Y. C. Ligand X must be a competitive inhibitor of ligand Y. D. Both ligands must bind to the same binding site on the protein. E. The protein has a higher affinity for ligand X than for ligand Y.