Terms: absorption, arterial, colloid osmotic, COPc, COPi, filtration, hydrostati

Question

Terms: absorption, arterial, colloid osmotic, COPc, COPi, filtration, hydrostatic, HPc, HPi, pulling, pushing, venous,

kindly use these terms to fill the balnks...

The capillary vessels in the vascular network represent the 'business end' of the circulatory system because they are the main sites where gas, nutrient and waste exchange occurs between the blood and the body's cells and tissues. Blood moves from an arteriole into a capillary vessel at the ____________ end of the capillary, traverses the length of the capillary and moves from the _____________ end of the capillary into the venous system whose venules and veins will return it to the heart. As the blood moves along the length of the capillaries, some of the plasma fluid is forced from the vessel into the surrounding interstitium and some fluid is forced from the interstitium back into the capillary vessels. When fluid moves from the capillary into the interstitium - the process is called _______________. In contrast, when fluid moves from the interstitium into the capillary vessels, this process is called ______________. There are 2 types of forces that drive fluid movement across capillary walls: 1) ___________ pressures - or the forces associated with water that is _____________ against the capillary walls and2) _____________ [a.k.a. oncotic] pressures - due to particles (primarily proteins), that are suspended in body fluids but cannot pass across the capillary cells. These types of particles (called colloids) create osmotic forces responsible for_______ water across the capillary walls in their directions. There are 2 different hydrostatic pressures regulating fluid movement across capillary walls. The water-based fluid component of the blood (i.e. the plasma) inside the capillary creates a pressure known as the hydrostatic pressure of the capillary (a.k.a. _____) as it pushes against the capillary wall from the inside trying to force its way out of the capillary. In contrast, the water-based fluid that bathes the capillaries on the outside of the vessels (i.e. the interstitial fluid) creates a force known as the hydrostatic pressure of the interstitium (a.k.a. ____) as it pushes against the capillary wall from the outside, trying to force its way inward. Similarly, there are 2 colloid osmotic pressures that govern fluid movement across capillary walls. Large proteins and other colloids that are trapped in the capillary because of their sizes, charges or hydrophilic characters create an osmotic force that tries to pull water from the interstitium in their directions; this force is called the colloid osmotic force of the capillary (a.k.a. __________). On the other hand, the large proteins and other colloids present and trapped in the interstitial fluids because of their sizes, charges, etc. create an osmotic force that tries to pull fluid from the plasma in their direction; this force is called the colloid osmotic pressure of the interstitium (a.k.a. ____________).

Explanation / Answer

The capillary vessels in the vascular network represent the 'business end' of the circulatory system because they are the main sites where gas, nutrient and waste exchange occurs between the blood and the body's cells and tissues. Blood moves from an arteriole into a capillary vessel at the arterial end of the capillary, traverses the length of the capillary and moves from the venous end of the capillary into the venous system whose venules and veins will return it to the heart. As the blood moves along the length of the capillaries, some of the plasma fluid is forced from the vessel into the surrounding interstitium and some fluid is forced from the interstitium back into the capillary vessels. When fluid moves from the capillary into the interstitium - the process is called filtration. In contrast, when fluid moves from the interstitium into the capillary vessels, this process is called absorption. There are 2 types of forces that drive fluid movement across capillary walls: 1) Hydrostatic pressures - or the forces associated with water that is pushing against the capillary walls and2) Osmotic [a.k.a. oncotic] pressures - due to particles (primarily proteins), that are suspended in body fluids but cannot pass across the capillary cells. These types of particles (called colloids) create osmotic forces responsible for pulling water across the capillary walls in their directions. There are 2 different hydrostatic pressures regulating fluid movement across capillary walls. The water-based fluid component of the blood (i.e. the plasma) inside the capillary creates a pressure known as the hydrostatic pressure of the capillary (a.k.a. HPc) as it pushes against the capillary wall from the inside trying to force its way out of the capillary. In contrast, the water-based fluid that bathes the capillaries on the outside of the vessels (i.e. the interstitial fluid) creates a force known as the hydrostatic pressure of the interstitium (a.k.a. HPi) as it pushes against the capillary wall from the outside, trying to force its way inward. Similarly, there are 2 colloid osmotic pressures that govern fluid movement across capillary walls. Large proteins and other colloids that are trapped in the capillary because of their sizes, charges or hydrophilic characters create an osmotic force that tries to pull water from the interstitium in their directions; this force is called the colloid osmotic force of the capillary (a.k.a. COPC). On the other hand, the large proteins and other colloids present and trapped in the interstitial fluids because of their sizes, charges, etc. create an osmotic force that tries to pull fluid from the plasma in their direction; this force is called the colloid osmotic pressure of the interstitium (a.k.a. COPi).

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