B.4B 5. When the concentration of molecules on both sides of a membrane is the same, the molecules will -- *
A. Move across the membrane to the outside of the cell.
B. Stop moving across the membrane.
C. Move across the membrane in both directions.
D. Move across the membrane to the inside of the cell.

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

Math focus 4. calculate a map has index contours at 250 m, 500 m, and 750 m. what is the contour interval?

When a population split into two subgroups what is most likely to cause the subgroups to develop different traits?