Page 28 - PG 101-Course notes مذكرة النظري 24-25 with spec

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

a- The Endoplasmic reticulum
Two types of ER are known:

Smooth (agranular) ER lacks ribosomes & makes proteins used in .
the Cell.

Rough (granular) ER has ribosomes on its surface & makes proteins to

EXPORT.

✓ Ribosomes are arranged in groups joined together with mRNA and called
polysomes. Both polysomes and ER are called ergastoplasm

What is Function of ER?

1- Forming the Skelton of the cell
2- Translocation of various substances
3- Protein and fat synthesis
4- Helping in keeping certain enzymes and metabolites separate

b- Ribosomes

■ They are minute, rounded to spherical bodies.

■ They are composed of RNA and protein.

■ They are characterized by their high protein synthesis.

✓ Most of ribosomes are attached to the outer surface of ER membranes.
Unattached ribosomes can be seen within the cytoplasm singly or attached in
groups (polysomes).

c- Golgi complex

Stacks of flattened sacs

What is the Function?

1- Cell wall formation (primary and secondary cell wall) and in
secretion process.

2- Intra- and intercellular transport.

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