~ 1 2 3
1
inches 1/8
4 5 6 7 8 9 10
2.
3
Based on the diagram provided, what is the approximate wavelength
of this wave?
O 5 cm
O 3.5 cm
0 7 cm
10 cm

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

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures