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27 Cards in this Set
- Front
- Back
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What 2 forces control movement of fluid through the capillary wall?
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blood pressure and osmotic pressure.
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What direction does osmotic pressure tend to cause water to move?
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In the opposite direction
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What is osmotic pressure created by?
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The presence of solutes dissolved in plasma.
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What is plasma?
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The liquid portion of blood.
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Where are most proteins manufactured?
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In the liver
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Why does water exit a capillary bed? What is the water in the vein called?
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Because the blood pressure is higher than the osmotic pressure at the arterial end of a capillary,
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What tends to cause water to move from capillary to tissue fluid?
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blood pressure NOT osmotic pressure
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What does osmotic pressure do?
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Causes things to come back: area of high concentration to low concentration caused by plasma proteins (albumin) and salts inside your blood.
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What type of proteins are of particular importance in maintaining the osmotic pressure?
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dissolved plasma proteins
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Where are most plasma proteins manufactured?
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In the liver
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From the arteriole to the venule, how does the osmotic pressure change?
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osmotic pressure increases as the blood pressure decreases.
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What happens midway along the capillary?
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The 2 forces that control movement of fluid through the capillary wall: blood pressure and osmotic pressure, essentially cancel each other out so there is no net movement of water.
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The net forces cancel each other out midway along the capillary, why is this important?
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Solutes can diffuse according to their concentration gradient: Oxygen and nutrients (glucose and amino acids) diffuse out of the capillary and Carbon dioxide and wastes diffuse into the capillary.
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What diffuses out and into the capillary and where does this take place and why?
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oxygen and nutrients diffuse out of the capillary, CO2 and wastes diffuse into the capillary. Takes place midway where the net forces cancel each other out allowing materials to diffuse according to their concentration gradient.
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Which way does water go at the arterial end of a capillary bed, why?
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blood pressure is higher than osmotic pressure at the arterial end of a capillary, water exits
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At which end does water exit out of the exchange?
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artiole end
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What diffuses out of the capillary and into the capillary midway along it?
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Oxygen and nutrients (glucose and amino acids) diffuse out, CO@ and waste diffuse into the capillary
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Veins carry what?
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CO2 and wastes AHA! CO2 goes back to lungs to be exhaled out! Crazy that :)
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What goes out and in, and what remains in the capillaries as blood moves through it?
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oxygen and nutrients (glucose and amino acids) diffuse out of the capillary, CO2 and wastes diffuse into the capillary; RBC's and almost all plasma proteins remain in the capillaries.
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What contributes to the tissue fluid between the body's cells? What is this fluid called?
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The substances that leave the capillaries (midway where diffusion takes place). Called interstitial fluid
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Since plasma proteins are too large to readily pass out of the capillary, what does tissue fluid contain to compensate for this?
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Contains all components of plasma, except much lesser amounts of protein.
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What happens at the venule end of the capillary?
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bp falls even more, osmotic pressure is greater. Water moves back INTO the capillary. Almost the same amount of fluid that left the capillary returns to it.
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What is albumin and where is commonly found and where is it made?
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generally refers to proteins that are water soluble, commonly found in blood plasma and made in the liver.
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At the venule end of a capillary where bp has fallen even more, almost all of the water goes back in, where does the other water go?
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excess fluid is always collected by the lymphatic capillaries.
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What is tissue fluid contained within lymphatic vessels called?
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lymph
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Where is lymph returned?
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To the subclavian veins under the collar bones.
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What is made by the liver and it is the protein found in plasma?
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Albumin
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