Hydrostatic vs Oncotic Pressure | Vascular Physiology🩺

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Hydrostatic vs Oncotic Pressure | Vascular Physiology

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▬▬▬▬▬▬▬▬▬▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬

00:00:00 Introduction
00:00:34 Hydrostatic Pressure
00:01:54 Colloid Osmotic Pressure or Holding Pressure
00:04:59 Filtration Pressure
00:05:29 Recap
00:05:57 Difference Between Colloid Osmotic Pressure & Oncotic Pressure
00:08:21 Drop in Hydrostatic Pressure and its results
00:12:16 Factors determining the amount of fluid in interstitial tissue

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Hydrostatic pressure is the pressure created by a fluid at rest due to gravity. It’s the kind of pressure you feel when plunging to the bottom of a pool. Hydrostatic pressure affects all fluids, including liquids and gasses because fluid is any material that can flow and change form. A hydrostatic fluid is not in action. As a result, hydrostatic pressure refers to the pressure inside a non-moving fluid, as compared to pressure exerted by, say, water from a fire hose.

This is the pressure caused by the fluid’s weight, or rather by the force of gravity pressing on the fluid. This indicates that fluid will exert force on an item based on its depth in the fluid, independent of its velocity. The definition of hydrostatic pressure is straightforward, based on the depth beneath the fluid surface h, gravity’s acceleration g, and fluid density ρ

Oncotic pressure, or colloid osmotic-pressure, is a type of osmotic pressure induced by the plasma proteins, notably albumin, in a blood vessel's plasma (or any other body fluid such as blood and lymph) that causes a pull on fluid back into the capillary. Participating colloids displace water molecules, thus creating a relative water molecule deficit with water molecules moving back into the circulatory system within the lower venous pressure end of capillaries.

It has the opposing effect of both hydrostatic blood pressure pushing water and small molecules out of the blood into the interstitial spaces within the arterial end of capillaries and interstitial colloidal osmotic pressure. These interacting factors determine the partition balancing of extracellular water between the blood plasma and outside the blood stream.

Oncotic pressure strongly affects the physiological function of the circulatory system. It is suspected to have a major effect on the pressure across the glomerular filter. However, this concept has been strongly criticised and attention has been shifted to the impact of the intravascular glycocalyx layer as the major player
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