Concept of Movement of Substances Across a Plasma Membrane (1)

Biology

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Concept of Movement of Substances Across a Plasma Membrane (1)

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Substances that can across plasma membrane freely

Non-polar molecules dan small uncharged molecules

Substances that require transport proteins to pass through the plasma membrane

1) Large polar molecules such as glucose, sucrose, amino acids, nucleic acids and polysaccharides 2) Charged ions

Types of transport without the usage of ATP

Passive transport; simple diffusion, facilitated diffusion and osmosis

Passive transport

The movement of substances across the plasma membrane follows the concentration gradient without using ATP

Concentration gradient

Refers to the difference in molecular concentration between one region and another

Simple diffusion

The random movement of molecules or ions from a high concentration region to a low concentration region

Osmosis

Diffusion of water from a high water potential region to a low water potential region across the semi-permeable membrane

Facililated diffusion

The movement of molecules across the plasma membrane and down the concentration gradient of those molecules with the help of carrier proteins and channel proteins

Active transport

Movement of substances across plasma membrane against the concentration gradient and uses ATP

Common factors that determine whether a molecule can pass through a plasma membrane

Molecule size , polar molecule and ionic charge

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