All cells must take up and turn out materials through the cell membrane. The plasma membrane P a...

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All cells must take up and turn out materials through the cell membrane. The plasma membrane
P acts as physical barrier between the cell and its surrounding environment and between the cell organelles and

W. the surrounding cytoplasm. The cell membranes are not freely permeable, i.e., they do not allow movement of all kinds of substances across them. Instead, these are selectively permeable, \( i \).e., they allow the entry or exit of only selected materials. Cell membranes allow the movement of different materials across them differently involving passive transport, active transport and bulk transport.
Name two processes of transport of materials which are slow, do not expend energy and do not use carrier proteins ?
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