Structure of Plasma Membrane (2)

Biology

Question

Structure of Plasma Membrane (2)

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Semi-permeable membrane/ selective permeable

A membrane that allows some types of molecules to move across it freely but prevents other types of molecules from moving across it

The necessity of movement of substances across a plasma membrane (1)

Living cells require substances from the external environment to carry out living processes

The necessity of movement of substances across a plasma membrane (2)

The metabolic processes in cells produce waste that need to be disposed of from the cells

The necessity of movement of substances across a plasma membrane (3)

Cells must allow some substances to move into and out of the cells to maintain the living processes

The necessity of movement of substances across a plasma membrane (4)

The movement of substances into and out of the cell is regulated by the plasma membrane

Structure of the plasma membrane (1)

Each cell is enclosed in a thin plasma membrane which separates the living cell from its environment

Structure of the plasma membrane (2)

According to the fluid mosaic model, protein molecules float within the phospholipid bilayer, forming a mosaic pattern that changes frequently

Structure of the plasma membrane (3)

Each phospholipid molecule consists of: • A polar head which is hydrophilic • A nonpolar tail which is hydrophobic

Structure of the plasma membrane (4)

The heads of the phospholipid molecule in the outer layer face the extracellular fluid, whereas the phospholipid heads in the inner layer face the cytoplasm

Structure of the plasma membrane (5)

The tails of the phospholipid molecule of the two layers face each other

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Structure of Plasma Membrane (2)

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