Page 21 - PG 101-Course notes مذكرة النظري 24-25 with spec

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Dic Medicinal plants (PG 101) Level 1 Clinical Pharmacy-PharmD

1- Cell wall
• Is semirigid, external, non-living.

• Present in plant cell but absent in most animal cells.
• It gives protection and support, covering the living plasma membrane beneath it.

• A fundamental difference between plant and animal cells is that the plant cell is
surrounded by a rigid cell wall, mostly made of polysaccharides (cellulose,
hemicellulose, pectin) and lignin.

✓ Cell wall is distinguished into three parts:

1- Middle Lamella

2- The primary cell wall

3- The secondary cell wall

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