ultrafiltration membrane - ορισμός. Τι είναι το ultrafiltration membrane
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Τι (ποιος) είναι ultrafiltration membrane - ορισμός

FIRST STEP OF FILTRATION FROM BLOOD IN THE KIDNEYS IN RENAL CORPUSCLES
Glomerular filtrate; Renal ultrafiltration; Ultrafiltration (renal)
  • Diagram showing the basic physiologic mechanisms of the kidney

Ultrafiltration (kidney)         
In renal physiology, ultrafiltration occurs at the barrier between the blood and the filtrate in the glomerular capsule (Bowman's capsule) in the kidneys. As in nonbiological examples of ultrafiltration, pressure (in this case blood pressure) and concentration gradients lead to a separation through a semipermeable membrane (provided by the podocytes).
Bruch's membrane         
MEMBRANE IN THE EYE
Bruch membrane; Bruchs membrane; Lamina vitrea; Brooks membrane; Lamina basalis choroideae
Bruch's membrane is the innermost layer of the choroid of the eye. It is also called the vitreous lamina or Membrane vitriae, because of its glassy microscopic appearance.
Membrane protein         
  • ionic interactions]] with membrane lipids (''e.g.'' through a [[calcium ion]])
  • transmembrane proteins]]: 1. a single transmembrane [[α-helix]] ([[bitopic membrane protein]]) 2. a polytopic transmembrane α-helical protein 3. a polytopic transmembrane [[β-sheet]] protein <br/>The membrane is represented in light-brown.
PROTEINS THAT ARE PART OF, OR INTERACT WITH, BIOLOGICAL MEMBRANES
Membrane proteins; Bacterial outer membrane protein; Protein Function in Cell Membranes; Bacterial outer membrane proteins
Membrane proteins are common proteins that are part of, or interact with, biological membranes. Membrane proteins fall into several broad categories depending on their location.

Βικιπαίδεια

Ultrafiltration (kidney)

In renal physiology, ultrafiltration occurs at the barrier between the blood and the filtrate in the glomerular capsule (Bowman's capsule) in the kidneys. As in nonbiological examples of ultrafiltration, pressure (in this case blood pressure) and concentration gradients lead to a separation through a semipermeable membrane (provided by the podocytes). The Bowman's capsule contains a dense capillary network called the glomerulus. Blood flows into these capillaries through the afferent arterioles and leaves through the efferent arterioles.

The high hydrostatic pressure forces small molecules in the tubular fluid 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 renal tubules. This process is called ultrafiltration; the resulting fluid, virtually free of large proteins and blood cells, is referred to as glomerular filtrate, or ultrafiltrate. Further modification of ultrafiltrate, by reabsorption and secretion, transforms it into urine.

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).

In hemodialysis centers, ultrafiltration takes place in a hemofilter on the hemodialysis machines, when the blood pressure is greater than the dialysate pressure (difference = transmembrane pressure (TMP)). This removes fluid from the blood while keeping its blood cells intact.