The most crucial factor determining the resting potential of a neuron is the diffusion of
A. potassium out of the cell through leak channels.
B. potassium into the cell through gated channels.
C. sodium out of the cell through leak channels.
D. sodium into the cell through gated channels.
A
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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.
A threshold stimulus applied to an excitable membrane is one that is just sufficient to:
A. trigger an excitatory postsynaptic potential. B. cause a change in membrane potential. C. trigger an action potential. D. be conducted to the axon hillock. E. depolarize a dendrite.
Total lung volume is approximately 5800 mLs.
Answer the following statement true (T) or false (F)
Though it does not articulate with any other bone, the hyoid bone is considered to be part of the axial skeleton.
Answer the following statement true (T) or false (F)