Question

What is Diffusion?
What is Breathing?​

Answer 1

diffusion, process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration. A familiar example is the perfume of a flower that quickly permeates the still air of a room.

Breathing: The process of respiration, during which air is inhaled into the lungs through the mouth or nose due to muscle contraction and then exhaled due to muscle relaxation.

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Answer 2

Diffusion:

   Diffusion is defined as the movement of individual molecules of a substances through semipermeable barrier from an area of higher concentration to an area of lower concentration.

Example:

   Take water in a beaker, add few copper sulfate crystal leave it for sometimes. Both the water and copper sulfate diffuses independently.

Types:

• Simple diffusion
• Facilitated diffusion.

Simple diffusion:

       A process in which substance moves through a semipermeable membrane or in a solution without any help from transport proteins.

Facilitated diffusion:

    It is a passive movement of molecules across the cell membrane from the region of higher to the low concentration by means of a carrier molecules.

Breathing:

• Breathing is the process of moving air out and in lungs to facilitate gas exchange with the internal environment, mostly to flush out carbon dioxide and bring in oxygen.
• The process take place by alveoli through diffusion. The body circulatory system transports these gases to and from the cells, where cell respiration takes place.
• Over-breathing( hyperventilation), under-breathing( hypoventilation), which is increase and decrease the arterial pressure of carbon dioxide respectively.
• Breathing has other important functions, it provides a mechanism for speech, laughter and similar expression of emotions. It also used to reflexes such as yawning, coughing and sneezing.