Page 23 - PG 101-Course notes مذكرة النظري 24-25 with spec
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Dic Medicinal plants (PG 101) Level 1 Clinical Pharmacy-PharmD
many woods) and suberin (a fatty material found in cork cells). The secondary wall differs
from the primary walls in that it is incapable of increase in area.
Pits and plasmodesmata
o Most cells have thin areas in the primary walls (no secondary wall layer), Which have
small pores through which strands of cytoplasm (plasmodesmata) connect the
protoplasm of one cell with that of the adjacent cell.
o Plasmodesmata aid in the movement of materials and transmit stimuli.
Walls
of two
adjacent
Vacuole
Plasmodesmata
Layers
of one plant
cell wall
Cytoplasm
Plasma membrane
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