Explain how light diffusion takes place. Describe how the Na / K pump works? Is this...

Explain how light diffusion takes place.

Describe how the Na / K pump works? Is this an example of active or passive transport?

Expert Solution

Diffusion:

Diffusion is Physical movement of molecules or ions, from higher concentration to lower concentration.

Diffusion may be classified as:

Simple diffusion- it is not related to transport across membranes or does not require membrane proteins for transport.
Facilitated diffusion or transport: Movement of molecules or ions through membranes, with aid of transmembrane integral proteins, from higher to lower concentration or towards concentration gradient. (Without energy expenditure). Like the uniport transport proteins.

Na+/K+ pumps

Na+/K+ pumps are active transporters.
They move ions against the concentration gradient.
Thus, they require ATP for driving of ions.
Without ATP, Na+/K+ pumps will not be able to pump any ions in or out of the vesicle.
Moreover, since there are equal concentration of ions in and out of the vesicle, there will be an equilibrium established.
It is an example of active transport.

gladiator answered 2 years ago

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