What is The Causes that make Intrapleural pressure is negative ??

[Askar]

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Hello ,,

Sorry for my language

First :
1 - We know That Intrapleural Pressure = 756 ( subatmosphare )
2 - and intraAlveoli Pressure = 760

That mean Streched Lung Beacuse there are Pressure Gradeint between (Intrapleural Pr and Intrapleural Pr )

Second :
1 - Intrapleural Pressure = 756 ( substmosphare )
2 - atmosphare Pressure = 760

That Mean Chest wall is compressed


My Quastion :
1 - How intrapleural Pressure Become Negatively ??????

Note : in my book written ( That factors make intrapleural Pressure Negatively is ( 1 - Alveoli recoil + Chest to become uncompressed ))

but iam not understanding and i cant combined The idea

please help me 🙁

 

[Etorphine]

Two forces:

Chest wall wants to expand out

and

Lungs want to recoil in

Imagine this is a physics sense, with the force of one pointed this way <-- and then the other -->.

Now imagine these forces acting on a closed container with a finite amount of gas volume, like a deflated balloon that is tied shut. Yanking on the sides of the balloon surface, with oppositely oriented forces will cause the gas inside to become negative in pressure relative to the outside air.

 

[BurghStudent]

Basically, there is a lag in compliance of the lungs to stretch out to the same volume that the intercostal muscles and diaphragm create when they contract. This small difference allows air to diffuse into the lungs during inhalation.

 

[Anastomoses]

Which part are you not understanding? Why it is negative at all or how it develops more negativity? Or how the alveoli gradient changes allowing air in and out?

 

[Askar]

Which part are you not understanding? Why it is negative at all or how it develops more negativity? Or how the alveoli gradient changes allowing air in and out?

Which part are you not understanding?

1 - Why it is negative at all ( yes )

2 - or how it develops more negativity? ( I known this mechanism ) it is not my quastion

3 - Or how the alveoli gradient changes allowing air in and out? ( Also I known this mechanism ) it is not my quastion


myquastion in number (1) how become nigative from birth to now !! how it is formation this negative pressure with in Detail ???

and other part of my quastion why we say that chest wall try to become unstreched ,, but there are force from front ( TransThoracic ) that pull chest in the body ... Two forces run counter to each other !!!! ???

I hope that my question become clear meaning

 

[IJL]

Somebody answer the damn quastion!!!

 

[Anastomoses]

Okay, that first poster - Etmorphine answered this part for you.

The structure of the chest wall and the lungs are in a resting configuration which causes this negative intrapleural pressure in this intrapleural space. The chest wall is trying to spring out. The lungs are trying to recoil, that is spring in. As these two are pulling in opposite directions they are creating a suction of the air air in this cavity. This negativity is the pressure at which they are balancing each other or creating an equilibrium.

You said you understand that when the diaphragm contracts and Boyle's law takes effect --> increases volume, thereby decreasing pressure further from the -5 or I think you have it as -4 to a further negative pressure of -8 until the diaphragm relaxes returning the pressure to the resting state.

 

[flameoflove]

Because Intrapleural Space is a closed space and it is some what stretchable i.e. it is somewhat elastic. So lung stretch it towards inside where as chest wall stretch it towards outside and at some point two forces balance each other. And as Volume increased pressure will decrease (Boyle's Law). It would be balanced with outside if there was a space for air to enter (happens in Pneumothorax).

 

[CherryRedDracul]

Because Intrapleural Space is a closed space and it is some what stretchable i.e. it is somewhat elastic. So lung stretch it towards inside where as chest wall stretch it towards outside and at some point two forces balance each other. And as Volume increased pressure will decrease (Boyle's Law). It would be balanced with outside if there was a space for air to enter (happens in Pneumothorax).

3 year bump, man ...

I miss Anastomoses <3.