Explain the glomerular filtration rate (gfr), Science

Assignment Help:

Explain the Glomerular Filtration Rate (GFR)

The kidneys receive a large amount of blood flow. The kidney blood flow is approximately 1200 ml per minute. One-tenth of this is filtered as the blood flows through the glomeruli i.e., about 120 ml. Filtration takes place through the semi-permeable walls of the glomerular capillaries, which are almost inlpermeable to proteins and large molecules. The filtrate is thus virtually free of proteins and has no cellular elements. The glomerular filtrate is formed by squeezing the fluid through the glomerular capillary bed.

The driving hydrostatic pressure (the pressure exerted by a liquid as a result of its potential energy) is controlled by the afferent and efferent arterioles (the muscular walled vessels leading to and from each glomerulus, and is provided by the arterial pressure, that is, the pressure of the circulating blood on the arteries. The glomerular filtration rate decreases with age and disease. In order to keep the renal blood flow and GFR relatively constant, the hydrostatic pressure in the glomerulus has to be kept fairly constant. When there is a change in the arterial blood pressure, there is a constriction or dilatation of the afferent and efferent arterioles. This process is called as autoregulation and can be more precisely defined as the tendency of the blood flow to organ to remain constant in spite of the pressure changes in the artery that delivers blood to that organ.


Related Discussions:- Explain the glomerular filtration rate (gfr)

Explain the composition and functions of gastric juice, Explain the Composi...

Explain the Composition and Functions of Gastric Juice In resting condition, the secretion of gastric juice is little in amount and is about 10- 15 ml. After taking each meal,

Explain the term liming - decreasing soil acidity, Explain the term Liming ...

Explain the term Liming - Decreasing Soil Acidity Acid soils can be managed in two ways, viz. either by growing crops suitable for particular soil pH or by treating the soils w

State about the soil water potential, Sate about the Soil water potential ...

Sate about the Soil water potential Electrical energy, potential energy and kinetic energy together are referred to as free energy or the energy status of water. The difference

Experiment of the rain cycle, The rain cycle You can reproduce the rain...

The rain cycle You can reproduce the rain cycle in miniature in your classroom. Place a box of plant seedlings on the table. Place a metal tray about 35 to 40 cm above the box

Levels, what would i need to do to achieve a 7C in science , KS3??

what would i need to do to achieve a 7C in science , KS3??

Characteristics and Properties, What is the difference between a a characte...

What is the difference between a a characteristic and a property?

Explain endoenzyme, Endoenzyme An  enzyme which  is not  secreted or ex...

Endoenzyme An  enzyme which  is not  secreted or exported out of the cell, but is kept and used by the cell which made it.

Define the functions of cerebrospinal fluid, Define the Functions of Cerebr...

Define the Functions of Cerebrospinal Fluid The CSF has many functions. These include the following: 1) It provides the optimum condition for a meaningful signal/stimulus. T

Phlebotomy, #question how can i easily remember the order of draw and the c...

#question how can i easily remember the order of draw and the colors of the tubes and their purpose? ..

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd