teefRcool said:
Hey guys can some one explain the whole capillaries and and osmotic pressure, hydrostatic pressure arteriole end and lymphatic system. Its not in the kaplan anywhere. But its all over the place in the questions.
I keep seeing questions about this i'm just lost I have no idea what its talking about. Could someone explain the whole process of what happens and how it works?
Thanks
__________________________________
_AE____________________________VE_
^ say this is your cappilliary!
Anatomy
on the left side, you have the arteriole end (AE), and on the right, your venule end (VE)
blood flows from the AE to the VE
Function
the cappiliary is the actual site of exchange of substances (it is once cell layer thick) - so obviously, this is where you have traffic across the membrane! eg. glucose, Oxygen, Carbon dioxide...
Lymphatic System (structure and fuction)
The structure of the lymphatic system is basically a vascular network designed as to 'pick up' extracellular fluid (ECF = fluid between cells of your body and the circulatory system). The system is 'one way', and gets dumped into blood circulation through the 'thoracic duct'.
The function of the lymphatic system is to 'pick up'
excess ECF and 'dump' it back into circulation. If it were not for this system, the extra cellular fluid would builds u, and cause edema (swelling).
(Now that you have the background)
back to the capilliary
__________________________________
_AE____________________________VE_
Some IMPORTANT terms:
Hydrostatic Pressure: Essentially, this 'pressure' is created, as
blood enters the AE of your cappiliary. It is important to note, that as blood enters, 'the pressure created will 'force' some on the components (those small enough) to pass through the 'one cell layer thick membrane', into the ECF.
Then What? Well, if your one step ahead of me, then you know that toward the VE end, your gonna have 'relativly higher amounts of large substances that cannot cross into the ECF.
Well, the large components remaining in the capilliary ALSO have a purpose., and you guessed it! It's to bring 'back in' some of the ECF.
Osmotic Pressure: 'Inside' your capiliary (VE end), these 'huge proteins' (eg. albumin). this protein 'cannot' cross the 'one cell thick membrane'. So, think of OSMOSIS; if you have a large concentration in one compartment, which direction will the water (or ECF) flow?
That's right! The Osmotic Pressure, is essentialy the Pressure that 'forces ECF
into the cappiliray'. If you understand this Osmosis (and i hope you do), then you should understand this.
In Conclusion:
hydrostatic pressure (HP) - forces OUT small blood components (oxygen, carbon dioxide, glucose) at AE end
osmotic pressure (OP)- forces IN ECF through 'Osmotic effects'
Ideally - we would have loved nature to have 'balanced HP and OP, as that there is NO net gain/loss of fluid in any compartment.
However, we are not that lucky:
The amount of fluid that enters the ECF (HP) is usually greater than the amount that is taken up (OP)
if this was left as is, then we would develop edema (swelling)
So, nature has given us the Lymphatic System, and if you read above, you know what this does.
If you have any further questions let me know
BTW - I'll bill you later!
👍
