Which of the following organelle acts as intracellular circulatory system?
A
Golgi apparatus
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B
Endoplasmic reticulum
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C
Mitochondria
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D
Plastid
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Solution
The correct option is B Endoplasmic reticulum Endoplasmic reticulum (ER) is a tube-like structure present in the cell, which extends all over the cell. The network of the endoplasmic reticulum is present in the cytoplasm. Endoplasmic reticulum (ER) exists as a membranous network enclosing a fluid-filled lumen which almost fills up the intracellular cavity. It is connected to the nuclear membrane. Hence, nucleo-cytoplasmic exchange of materials is carried out by endoplasmic reticulum. Intracellular transport is also carried by ER through its lumen to Golgi body, cytoplasm and plasma membrane.