What directions glomerular hydrostatic pressure,capsule hydrostatic pressure and blood colloid osmotic pressure will cause fluid to move.I've tried to look on internet differen imformations but just don't get it.Thank you for your time
Glomerular hydrostatic pressure, capsule hydrostatic pressure, and blood colloid osmotic pressure are all important factors in determining the movement of fluid in the kidneys.
To understand their effects, it's helpful to first understand the structure of the kidney's filtering unit, called the nephron. The nephron consists of the glomerulus (a network of tiny blood vessels) and the renal tubule.
1. Glomerular hydrostatic pressure: This refers to the pressure exerted by the blood in the glomerulus. It is the main driving force for filtration in the kidneys. When blood enters the glomerulus, its pressure pushes fluid (called filtrate) out of the glomerulus and into the renal tubules. This fluid contains waste products, ions, and water.
If the glomerular hydrostatic pressure increases, it can lead to increased filtration and increased urine production. Conversely, if the pressure decreases, filtration and urine production will be reduced.
2. Capsule hydrostatic pressure: This refers to the pressure exerted by the fluid in the renal capsule (also called Bowman's capsule), which surrounds the glomerulus. The pressure in this space opposes filtration. If the pressure inside the capsule increases, it can hinder the movement of fluid from the glomerulus into the tubules. If the pressure in the capsule is lower than the glomerular hydrostatic pressure, it facilitates filtration.
3. Blood colloid osmotic pressure: This refers to the osmotic pressure exerted by proteins (mostly albumin) in the blood. This pressure tends to pull fluid back into the blood vessels from the renal tubules. It is mainly caused by the presence of proteins in the blood, which exert osmotic force to maintain fluid balance.
If blood colloid osmotic pressure is higher than the glomerular hydrostatic pressure, it will oppose filtration and promote reabsorption of fluid from the tubules back into the bloodstream. If it is lower than the glomerular hydrostatic pressure, it facilitates filtration and reduces reabsorption.
In summary, glomerular hydrostatic pressure promotes filtration, capsule hydrostatic pressure opposes filtration, and blood colloid osmotic pressure opposes filtration and promotes reabsorption. The balance and interactions between these pressures determine the movement of fluid in the kidney.