ATP is most likely being used for 1.
substance A to enter the cell
2
.
substance B to enter the cell
3.
both substances to enter the cell
4.
neither substance to enter 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

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms

If animal agriculture was eliminated, how much grain would become available for human consumption?