https://padlet.com/925145967/n5jb3pxo7vm7 Explanation of human ventilation en-us 2017-03-20 02:43:06 UTC 2024-12-12 21:54:54 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Rafaelo.png 925145967 https://padlet.com/925145967/n5jb3pxo7vm7/wish/161056260

Inspiration- when you breathe in air, your diaphragm contracts and flattens at the same time. Ribs raised upward and outward while the external intercostal muscles contract and the internal intercostal muscles relax. The movements of diaphragm and ribcage move chest cavity and pull on the lungs so they occupy a larger volume.  This decreases the air pressure inside the lungs to below the pressure of atmospheric air, so that air moves through your nose and mouth into the lungs and they inflate. 

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Expiration- when you breathe out air, your diaphragm and external intercostal muscles relax and the internal intercostal muscles contract. This causes ribs go downward and inward. Diaphragm bulges up due to pressure from the organs below and contraction of the abdominal muscles. There actions cause chest cavity to decrease in volume, causing the pressure inside the thorax to increase. And the air pressure in the lungs increases to above atmospheric pressure so air is forced out helped by the elastic recoil of the alveoli. 

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Inspiration steps- 

1. The external intercostal muscles contract and the internal intercostal muscles relax. 
2. The diaphragm contracts and flattens at the same time.
3. Ribcage go outwards and upwards.
4. These actions make the lungs occupy a larger volume. The pressure inside the chest decrease.
5. Air moves into the lungs through nose or mouth when the air pressure in lungs below to the pressure of atmospheric air.
6. Breathe in air.

]]> 2017-03-22 06:55:54 UTC https://padlet.com/925145967/n5jb3pxo7vm7/wish/161717555 925145967 https://padlet.com/925145967/n5jb3pxo7vm7/wish/162070309 http://www.ivyroses.com/HumanBody-Images/Respiratory/LowerRespiratoryTract_cIvyRose.jpg]]> 2017-03-23 10:39:58 UTC https://padlet.com/925145967/n5jb3pxo7vm7/wish/162070309 925145967 https://padlet.com/925145967/n5jb3pxo7vm7/wish/162085676 Expiration steps-

1. The external intercostal muscles relax and the internal intercostal muscles contract.
2. The diaphragm relax and bulges up.
3. Ribcage go downwards and inwards.
4. These actions make the volume lungs occupy be smaller. The pressure in the lungs increases.
5. Air moves out of the lungs through nose or mouth when the air pressure in lungs above to the pressure of atmospheric air.
6. Breathe out air.[ alveoli helps

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Intercostal muscles- move the ribs.

External muscles- closer to the skin.

Internal muscles- far from the skin.

Diaphragm- made of tough fibrous tissue. connect to the backbone, the lower ribs and the sternum. Change the volume of the lungs move air by moving up and down.

Hairs in the air exchange system- goblet cells and ciliated epithelial cells keep the pathogens out of your lungs. Secret mucus.

Cilia-remove the pathogens.

Lungs- spongy organs.

Trachea- connect the throat to the lungs. Has C-shaped cartilages.

Layrnx➡️Trachea➡️Bronchi➡️Bronchioles➡️Alveoli(Oxygen goes into alveoli and gas exchange happens here.)➡️Capillary network.  

Alveoli- surrounded by elastic tissues.

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