Muscle cells are responsible for the movement of our chest during breathing, as their contraction and relaxation cause the chest to expand and contract, facilitating the process of inhalation and exhalation.
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Except for phloem fibres, all other phloem cells (sieve cells, sieve tubes, companion cells, and phloem parenchyma) are living cells.
The main function of phloem is to transport food from the leaves to other parts of the plant.
The five types of cells that make up the phloem are sieve cells, sieve tubes, companion cells, phloem fibres, and phloem parenchyma.
Secondary meristem located in the cortex produces layers of cork cells as part of secondary growth in plants. This process adds to the thickness and protective function of the outer layer of branches and stems.