Question

Describe human respiratory system in points

Answer 1

Hey Friend !

The air , passes through the nostrils.
The air that is passing is filtered by the fine hairs , which lines the passage.
Also , mucus helps in lining the passage , in the process involved.
From here , air passes through the throat and then into the lungs
In the throat , rings of cartilage are present , which ensures that the air passage does not collapse.

In the lungs , the passage is divided into very smaller tubes , that terminate into balloon like structures known as alveoli.

Alveoli is a surface that helps in the exchange of gases.

Extensive network of blood vessels is present in the walls of alveoli

When we breathe in , our ribs are lifted and diaphragm is flattened.
As a result , chest cavity becomes larger in size.

Therefore ,the air is sucked into the lungs , expanding the alveoli

Carbon dioxide are released into the alveoli by blood.

Oxygen in the alveolar air is taken by alveolar blood vessels , and is transported to all the cells in the body.

Answer 2

Respiratory system :


pathway of air :

Nostrils​ => Nasal cavity => Pharynx => Larynx => Trachea = Bronchus => Bronchioles => Alevelos => Blood.

Nostrils : Air enters into our body through Nostrils.

Nasal cavity : In nasal cavity the air is filtered. The cavity has hairs growing from the sides which remove dust In the air. And the cavity is moist.

Pharynx : This is the common passage of digestive tract and wind pipe. Here, Epiglottis a flap like muscular valve controls the food and wind to thier respective passages.

Layrnx : This part contains our vocal cords. when air moves over them, they vibrate and produce sound!

Trachea : Wind pipe channeling to trachea. and to lungs.

Bronchus : Wind pipe is divided into ​two pipes one leading to each lung.

Bronchioles : The Bronchus is divided into further smaller branches called Bronchioles.

Alevelos : These are clusters of air sacs. They are numerous. here blood capillaries take up the oxygen and expel CO2.

Blood : And finally oxygen dissolves in blood and travels to each and every cell.


DIAPHRAGM.

An important part which helps in respiration. it is done shaped.

Mechanism of diaphragm :

During inhalation the dome shaped diaphragm flattens and the volume of chest cavity increases. As a result air outside rushes into the lungs.

During exhalation the diaphragm relaxes and retains it dome shape. And as a result the volume of chest cavity decreases and air inside the lungs rushes out.

:)