What is the approximate temperature at the mantle-outer core boundary?
a 7,000°C
b 4,500°C
c 1,500°C
d 5,000°C

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

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

What is the role of the phospholipid belayer in cellular transport in living cells