The hilum of the spleen is part of its
A. concave anteromedial border.
B. concave posterolateral border.
C. convex anteromedial border.
D. convex posterolateral border.
A
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Once cells in the SA node reach threshold,
A. nothing happens until the AV node is innervated. B. the heart stops beating. C. an action potential is triggered. D. a heart attack occurs.
This figure shows a lymph node and its components. The region indicated by number 1 is a
A. germinal center. B. mantle zone. C. cortical sinus. D. medullary cord. E. medullary sinus.
Hemolysis refers to the inability of swollen erythrocytes to transport O2 efficiently
Indicate whether the statement is true or false
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 have greater specificity than the binding site for ligand Y. B. The protein has a higher affinity for ligand X than 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 binding sites for ligand X are 100% saturated.