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Why is the afferent arteriole larger than than the efferent arteriole?
Wiki User
∙ 7y ago
Lot of fluid is filtered out in the glomeruli. Almost 180 litres of fluid per day is filtered in glomeruli. So to maintain the blood pressure in afferent arterioles, you need to have efferent arterioles with less diameter.
Wiki User
∙ 9y ago
Wiki User
∙ 11y agoEfferent arteriole is narrower so as to create hydrostatic pressure for the process of ultrafilteration.
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What blood is found in the efferent arteriole?
Here efferent arteriole word is used indicating 'portal' ciculation. It is should be diagonally apposite to afferent arteiole. With most of the 'fluid' filtered through glomeruli. Numbering about 1 million in each kidny. ( kidney filters about 180 liters/ day of fluid filtered through glomeruli and reabsorb more than 180 liters of it. )
How is kidney nephron adapted to its function?
Blood is filtered through the capillaries of the glomerulus into the Bowman's capsule. The Bowman's capsule empties the filtrate into a tubule that is also part of the nephron. The function of the glomerulus is to filter the resultant fluid that will become urine.
What is the function of the glomerolus?
In the kidney, a tubular structure called the nephron filters blood to form urine. At the beginning of the nephron, the glomerulus /ɡlɒˈmɛrələs/ is a network (tuft) of capillariesthat performs the first step of filtering blood.The glomerulus is surrounded by Bowman's capsule. The blood is filtered through the capillaries of the glomerulus into the Bowman's capsule. The Bowman's capsule empties the filtrate into a tubule that is also part of the nephron.A glomerulus receives its blood supply from an afferent arteriole of the renal circulation. Unlike most other capillary beds, the glomerulus drains into an efferent arteriole rather than a venule. The resistance of these arterioles results in high pressure within the glomerulus, aiding the process of ultrafiltration, where fluids and soluble materials in the blood are forced out of the capillaries and into Bowman's capsule.A glomerulus and its surrounding Bowman's capsule constitute a renal corpuscle, the basic filtration unit of the kidney. The rate at which blood is filtered through all of the glomeruli, and thus the measure of the overall renal function, is the glomerular filtration rate (GFR).
What are asteroids larger than?
Asteroids are larger than Meteoroids.
Which is larger 0013 or 02?
.02 is larger than .0013 (13 is larger than 2 if they are not decimals)
Why is the efferent arteriol smaller than afferent arteriole?
Efferent arteriole is narrower so as to create hydrostatic pressure for the process of ultrafilteration.
Is the afferent arteriole entering the glomerulus always thicker than the efferent arteriole leaving the glomerulus?
It always has a widre lumen so that blood is forced to diffuse and filter. This puts a little more stress on the afferent arteriole and so a slight increase in the thickness of the tunica media may be noted.
Explain how the blood vessels associated with the renal corpuscle help to maintain a relatively high blood pressure within the glomerulus?
The cluster of capillaries that forms a glomerulus arises from an afferent arteriole. After passing through the glomerular capillaries, blood (minus any filtered fluid) enters an efferent arteriole whose diameter is smaller than that of the afferent vessel. This is instead of entering a venule, the usual circulatory route. The efferent arteriole resists blood flow to some extent, which backs up blood into the glomerulus, increasing pressure in the glomerular capillary.
How high blood pressure built up in the glomerulus?
It builds up because the calibre of the efferent arteriole is less than that of the afferent arteriole. The cappilary pressure is opposed by the lower osmotic pressure or the blood and the lower filtrate hydrostatic pressure in the glomerular capsule.
What blood is found in the efferent arteriole?
Here efferent arteriole word is used indicating 'portal' ciculation. It is should be diagonally apposite to afferent arteiole. With most of the 'fluid' filtered through glomeruli. Numbering about 1 million in each kidny. ( kidney filters about 180 liters/ day of fluid filtered through glomeruli and reabsorb more than 180 liters of it. )
What happens if the diameter of the efferent arteriole is constricted?
When the afferent arteriole is constricted it causes blood to be unable to flow into the glomerulus, overall decreasing hydrostatic pressure and causing the bowman's capsule to decrease filtration.
Why is glomerulus a high pressure capillary bed?
The diameter of the afferent renal arteriole narrows progressively more and more into the glomerular capillaries, with the same blood flow, leading to an increase in pressure within the glomerulus. This is so that the high pressure can force solutes and water across into the Bowman's capsule for the renal tubules.
What is the difference between afferent and efferent nerve fibers?
Afferent refers to pathways leading to the cortex (ie, sensory). Efferent are pathways leading away (ie, motor). You are *affected* by a situation, you *effect* change on someone else.
Why does blood get filtered by the kidneys?
Blood pressure promotes filtration of blood in the kidneys by, generally, being greater in pressure than blood colloid osmotic pressure and glomerular capsule pressure which produces a net filtration pressure of about 10 mm Hg. Net filtration pressure forces a large volume of fluid into the capsular space. When blood pressure increase or decreases slightly, changes in the diameters of the afferent and efferent arterioles can actually keep net filtration pressure steady to maintain normal glomerular filtration. Constriction of the afferent arteriole decreases blood flow into the glomerulus, which decreases net filtration pressure. Constriction of the efferent arteriole slows outflow of blood and increases net filtration pressure.
Of what importance is the fact that there are fewer efferent than afferent lymphatics associated with lymph nodes?
The passage of lymph through the sinuses is slowed, which allows time for the cleansing process.
What structure ensures a slow flow of the lymph nodes?
Lymph enters the lymph node through a series of afferent lymphatic vessels and exits the lymph node via efferent lymphatic vessels. There are more afferent lymphatic vessels than there are efferent lymphatic vessels, slowing down the flow. The reason the slow flow is desirable is that it allows time for lymphocytes and macrophages to carry out their protective functions of removing debris from lymph.
What vessel does the lymph exit through?
A lymph vessel. They are similar in function to blood vessels. However the lymph is moved along the vessel by muscle contractions rather than by the heart pumping.
