What is Bowmans capsule and ultrafiltration ?  

1. The renal artery contains blood at very high pressure which enters the glomerulus via the short afferent arteriole.



2. The efferent arteriole has a smaller diameter than the afferent arteriole.

The high pressure forces small molecules such as water, glucose, amino acids, sodium chloride and urea through the filter, from the blood in the glomerular capsule across the basement membrane of the Bowman's capsule and into the nephron. This type of high pressure filtration is ultrafiltration. The fluid formed in this way is called glomerular filtrate. Large molecules such as plasma proteins and blood cells do not pass through the filter because they are too big. Human kidneys viewed from behind with spine removed The renal arteries normally arise off the abdominal aorta and supply the kidneys with blood. ... Water is a tasteless, odourless substance that is essential to all known forms of life and is known as the universal solvent. ... Glucose (Glc), a monosaccharide (or simple sugar), is the most important carbohydrate in biology. ... In chemistry, an amino acid is any molecule that contains both amino and carboxylic acid functional groups. ... Sodium chloride, also known as common salt, table salt, or halite, is a chemical compound with the formula NaCl. ... Urea is an organic compound of carbon, nitrogen, oxygen and hydrogen, with the formula CON2H4 or (NH2)2CO. Urea is also known as carbamide

Answered by Santosh Kuma at 1:40 PM on September 04, 2008

hi there

The Bowman's capsule \) is a cup-like sac at the beginning of the tubular component of a nephron in the mammalian kidney. A glomerulus is enclosed in the sac. Fluids from blood in the glomerulus are collected in the Bowman's capsule (i.e., glomerular filtrate) and further processed along the nephron to form urine. This process is known as ultrafiltration.

Answered by Reeta K at 4:13 PM on August 25, 2008

The Bowman's capsule (other names: capsula glomeruli, glomerular capsule) is a cup-like sac at the beginning of the tubular component of a nephron in the mammalian kidney. A glomerulus is enclosed in the sac. Fluids from blood in the glomerulus are collected in the Bowman's capsule (i.e., glomerular filtrate) and further processed along the nephron to form urine. This process is known as ultrafiltration.

And for more information on this topic visit the source site:
http://en.wikipedia.org /wiki/Bowman%27s_capsule

Answered by Dinesh at 7:38 AM on August 14, 2008

well, n biological terms, Ultrafiltration occurs at the barrier between the blood and the filtrate in the renal corpuscle or Bowman's capsule in the kidneys. The Bowman's capsule contains a dense capillary network called the glomerulus. Blood flows into these capillaries through a wide afferent arteriole and leaves through a narrower efferent arteriole. The blood pressure inside these capillaries is high because: A renal corpuscle is the initial filtering component of a nephron in the kidney. ... Bowmans Capsule is a blind sac at the beginning of a the tubular component of a nephron in the mammalian kidney. ... Human kidneys viewed from behind with spine removed The kidneys are bean-shaped excretory organs in vertebrates. ... The glomerulus is a capillary bed found surrounded by the Bowmans capsule of the nephron in the vertebrate kidney. ... The word capillary is used to describe any very narrow tube or channel through which a fluid can pass. ... An arteriole is a blood vessel that extends and branches out from an artery and leads to capillaries. ...

1. The renal artery contains blood at very high pressure which enters the glomerulus via the short afferent arteriole.
2. The efferent arteriole has a smaller diameter than the afferent arteriole.

The high pressure forces small molecules such as water, glucose, amino acids, sodium chloride and urea through the filter, from the blood in the glomerular capsule across the basement membrane of the Bowman's capsule and into the nephron. This type of high pressure filtration is ultrafiltration. The fluid formed in this way is called glomerular filtrate. Large molecules such as plasma proteins and blood cells do not pass through the filter because they are too big. Human kidneys viewed from behind with spine removed The renal arteries normally arise off the abdominal aorta and supply the kidneys with blood. ... Water is a tasteless, odourless substance that is essential to all known forms of life and is known as the universal solvent. ... Glucose (Glc), a monosaccharide (or simple sugar), is the most important carbohydrate in biology. ... In chemistry, an amino acid is any molecule that contains both amino and carboxylic acid functional groups. ... Sodium chloride, also known as common salt, table salt, or halite, is a chemical compound with the formula NaCl. ... Urea is an organic compound of carbon, nitrogen, oxygen and hydrogen, with the formula CON2H4 or (NH2)2CO. Urea is also known as carbamide, especially in the recommended International Non-proprietary Names (rINN) in use in Europe. ...


http://www.nationmast er.com/encyclopedia/Ultrafiltr ation-(renal)

Answered by Satya ~ at 5:03 PM on August 13, 2008

The Bowman's capsule is the origin of the nephron, which is the functional unit of the vertebrate kidney (yes, that means it's in humans). The Bowman's capsule receives blood plasma from the glomerulus. The glomerulus is nested inside the Bowman's capsule. The blood plasma is forced from the glomerulus through the process of ultrafiltration

Answered by SESHAN at 2:36 PM on August 13, 2008

The Bowman's capsule is a cup-like sac at the beginning of the tubular component of a nephron in the mammalian kidney. A glomerulus is enclosed in the sac. Fluids from blood in the glomerulus are collected in the Bowman's capsule and further processed along the nephron to form urine. This process is known as ultrafiltration.

Answered by Ivan Dantes at 11:26 AM on August 13, 2008

In biological terms, ultrafiltration occurs at the barrier between the blood and the filtrate in the renal corpuscle or Bowman's capsule in the kidneys. The Bowman's capsule contains a dense capillary network called the glomerulus. Blood flows into these capillaries through a wide afferent arteriole and leaves through a narrower efferent arteriole. The blood pressure inside these capillaries is high because:

The renal artery contains blood at very high pressure which enters the glomerulus via the short afferent arteriole.
The efferent arteriole has a smaller diameter than the afferent arteriole.
The high pressure forces small molecules such as water, glucose, amino acids, sodium chloride and urea through the filter, from the blood in the glomerular capsule across the basement membrane of the Bowman's capsule and into the nephron. This type of high pressure filtration is ultrafiltration. The fluid formed in this way is called glomerular filtrate.

Glomerular pressure is about 75 millimeters of mercury (10 kPa). It is opposed by osmotic pressure(30 mmHg, 4.0 kPa) and hydrostatic pressure (20 mmHg, 2.7 kPa) of solutes present in capsular space. This difference in pressure is called effective pressure(25 mmHg)(3.3 kPa).

It is also used in hemodialysis to clean whole blood while keeping its composition intact.

visit en.wikipedia.org/

Answered by Jyothi at 11:03 AM on August 13, 2008

hello sana
The Bowman's capsule(other names: capsula glomeruli, glomerular capsule) is a cup like sac at the beginning of the tubular component of a nephron in the mammalian kidney. A glomerulus is enclosed in the sac. Fluids from blood in the glomerulus are collected in the Bowman's capsule (i.e., glomerular filtrate) and further processed along the nephron to form urine.

Ultrafiltration
In biological terms, Ultrafiltration occurs at the barrier between the blood and the filtrate in the renal corpuscle or Bowman's capsule in the kidneys. The Bowman's capsule contains a dense capillary network called the glomerulus. Blood flows into these capillaries through a wide afferent arteriole and leaves through a narrower efferent arteriole. The blood pressure inside these capillaries is high because:
The renal artery contains blood at very high pressure which enters the glomerulus via the short afferent arteriole.
The efferent arteriole has a smaller diameter than the afferent arteriole.

The high pressure forces small molecules such as water, glucose, amino acids, sodium chloride and urea through the filter, from the blood in the glomerular capsule across the basement membrane of the Bowman's capsule and into the nephron. This type of high pressure filtration is ultrafiltration. The fluid formed in this way is called glomerular filtrate. Large molecules such as plasma proteins and blood cells do not pass through the filter because they are too big.

formore detail refer
http://www.nationmaster.com/ encyclopedia/Ultrafiltration-(renal )

Answered by Saq at 11:00 AM on August 13, 2008

well,ultrafiltration occurs at the barrier between the blood and the filtrate in the renal corpuscle or Bowman's capsule in the kidneys. The Bowman's capsule contains a dense capillary network called the glomerulus. Blood flows into these capillaries through a wide afferent arteriole and leaves through a narrower efferent arteriole. The blood pressure inside these capillaries is high because:

1. The renal artery contains blood at very high pressure which enters the glomerulus via the short afferent arteriole.
2. The efferent arteriole has a smaller diameter than the afferent arteriole.

The high pressure forces small molecules such as water, glucose, amino acids, sodium chloride and urea through the filter, from the blood in the glomerular capsule across the basement membrane of the Bowman's capsule and into the nephron. This type of high pressure filtration is ultrafiltration. The fluid formed in this way is called glomerular filtrate.

Glomerular pressure is about 75 millimeters of mercury (10 kPa). It is opposed by osmotic pressure(30 mmHg, 4.0 kPa) and hydrostatic pressure (20 mmHg, 2.7 kPa) of solutes present in capsular space. This difference in pressure is called effective pressure(25 mmHg)(3.3 kPa).

It is also used in hemodialysis to clean whole blood while keeping its composition intact.
source:
en.wikipedia .org/wiki/Ultrafiltration_(ren al)

Answered by Debashis at 9:22 AM on August 13, 2008

Ultrafiltration is a vital mechanism in the vertebrate kidney: the cell membranes lining the Bowman's capsule act as semipermeable membranes, allowing water and substances of low molecular weight such as urea and salts to pass through into the urinary tubules but preventing the larger proteins from being lost from the blood.

Answered by alok at 7:39 AM on August 13, 2008