BODY FLUID TRANSPORT Flashcards
Cell Membrane Transport
Diffusion and Osmosis happens HERE
Phospholipid Bilayer
This is within the cell membrane and its function is to separate the intacellular compartment from the extracellular.
It is semi permeable which means it’s picky with what has to pass through him depending on the size , charged or non charged ions
Simple diffusion
Simple diffusion is a passive form of transport where solutes and molecules move from higher concentration to a lower concentration via the phospholipids bilayer .
It only allows small sized and non charged ions through it. Eg. Oxygen and Carbon dioxide
Facilitated Diffuision
This also a passive form of transport where larger and charged (not allowed by phospholipid bilayer ) solutes and molecules moved from an area of higher concentration to an area of lower concentration with the aid HELPER PROTEINS to cross the cell membrane.
Eg. Glucose , ions
ACTIVE TRANSPORT ( energy involved)
The movements of solutes and molecule from an are of LOWER CONCENTRATION TO HIGHER CONCENTRATION with the help of ATP (Adenosine Triphoshate)
This goes AGAINST the concentration gradient
The molecules go through special protein chanels .
OSMOSIS (water)
The movement of water from an area of higher concentration to an area of lower concentration.
This is also a passive form of transport.
When there is too much solute at a place eg. Sodium/ Albumin, water wants to move to that place hence osmosis to maintain homeostasis.
ONCOTIC PRESSSURE VS HYDROSTATIC PRESSURE
Dealing with intravascular (capillary) and interstitial spaces (tissue spaces).
These pressures maintain homeostasis in these body compartments.
ONCOTIC PRESSURE/COLLOIDAL OSMOTIC PRESSURE
This is the pull force that draws fluid from the interstitial spaces into the capillary spaces .
The PROTEIN that initiates this whole drama is ALBUMIN which is also a colloid.
They are usually within the capillary because of its large nature ( not permeable to the capillary wall), so when it becomes accumulated there( high osmolarity) it draws fluid from the interstitial compartment to the capillary till homeostasis achieved .
When a patient have hypoalbuminaemia, they usually get oedema because the albumin which will initiate the osmosis needed to draw fluid from the interstitial spaces is low , hence its left there
HYDROSTATIC PRESSURE
This is the push pressure that pushes fluid and solutes from the intavascular spaces to the interstitial spaces .
The GOAL of hydrostatic pressure is to create a filtration force that will filter both water and solutes to the interstitial spaces
When it comes to the human body, Hydrostatic pressure comes about with the contraction of the heart for this reason there is higher pressure at the arterial end of the capillary than in the venous end.
It is the pressure that force a fluid inside a restricted space
HYDROSTATIC PRESSURE
This is the push pressure that pushes fluid and solutes from the intavascular spaces to the interstitial spaces .
The GOAL of hydrostatic pressure is to create a filtration force that will filter both water and solutes to the interstitial spaces
When it comes to the human body, Hydrostatic pressure comes about with the contraction of the heart for this reason there is higher pressure at the arterial end of the capillary than in the venous end.
It is the pressure that force a fluid inside a restricted space
