Which describes the function of plasmaodesmata
a. they provide rigid support for the cell
b. they store water and collect poisons.
c. they store glucose made during photosynthesis.
d. they allow molecules to move between cells.

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

Use the distance formula to determine weather each pair of segments have the same length

Explain how mendel kept his pea plant from self pollination