The nephron is the structural and functional unit of the kidney that filters blood to form urine. It consists of a renal corpuscle containing the glomerulus and Bowman's capsule, and renal tubules. The glomerulus filters blood to form filtrate, which passes through three segments of the tubules - the proximal convoluted tubule, loop of Henle, and distal convoluted tubule. These tubule segments reabsorb essential substances and further concentrate the filtrate through selective reabsorption and secretion to produce urine and maintain electrolyte and pH balance.
The nephron is the microscopic structural and functional unit of the kidney. It is composed of a renal corpuscle and a renal tubule. The renal corpuscle consists of a tuft of capillaries called a glomerulus and an encompassing Bowman's capsule. The renal tubule extends from the capsule.
This was done as a Student presentation on the kidney.
Here following topics are covered.
Macroscopic structure of the urinary system
Microscopic anatomy of the urinary system
Functions of the nephron
Renal blood supply
Kidneys and blood pressure regulation
Structure of ureters and urinary bladder to perform its function
Renal failure
The nephron is the microscopic structural and functional unit of the kidney. It is composed of a renal corpuscle and a renal tubule. The renal corpuscle consists of a tuft of capillaries called a glomerulus and an encompassing Bowman's capsule. The renal tubule extends from the capsule.
This was done as a Student presentation on the kidney.
Here following topics are covered.
Macroscopic structure of the urinary system
Microscopic anatomy of the urinary system
Functions of the nephron
Renal blood supply
Kidneys and blood pressure regulation
Structure of ureters and urinary bladder to perform its function
Renal failure
The urinary system, also known as the renal system or urinary tract, consists of the kidneys, ureters, bladder, and the urethra. The purpose of the urinary system is to eliminate waste from the body, regulate blood volume and blood pressure, control levels of electrolytes and metabolites, and regulate blood pH.
Human kidney,structure and functions of kidneyAnand P P
human kidney structural and functions.different types of structural components present in kidney and each structure having definite functions.structural and functional aspects of kidney.
Nephron (The Guyton and Hall physiology)Maryam Fida
Structural and Functional unit of kidney is called nephron.
There are about 1.3 million nephron in each kidney.
New nephrons can not be regenerated by kidneys.
Functioning nephrons decrease about 10 % every 10 years at the age of 40.
At the age of 80, there are 40 % of functioning nephrons as compared to 40 yrs.
It is formed by two parts.
1. GLOMERULUS
2. BOWMAN’S CAPSULE
1- Glomerulus:
It consists of tuft of glomerular capillaries.
There is anastomosing & branching network of glomerular capillaries.
Glomerular capillaries have high hydrostatic pressure (nearly 60 mm Hg) as compared with other capillaries.
Glomerulus is surrounded by a membranous cover called Bowman’s capsule.
Each glomerulus is about 0.2 mm in diameter.
Glomerulus and Bowman’s capsule together constitute renal corpuscle.
Each renal tubule is divided into various part as they have different functions.
i- Proximal convulated tubule.
It is continuation of Bowman’s capsule.
ii- Loop of Henle. It is continuation of prox. conv. tubule.
* Loop of Henle has three parts.
a- descending limb,
b- u turn or bend in medulla and
c- ascending limb.
Ascending limb has initial thin segment followed by thick segment.
At the end of thick ascending limb, there is short segment called macula densa, which plays important role in controlling functions of nephron.
The urinary system, also known as the renal system or urinary tract, consists of the kidneys, ureters, bladder, and the urethra. The purpose of the urinary system is to eliminate waste from the body, regulate blood volume and blood pressure, control levels of electrolytes and metabolites, and regulate blood pH.
Human kidney,structure and functions of kidneyAnand P P
human kidney structural and functions.different types of structural components present in kidney and each structure having definite functions.structural and functional aspects of kidney.
Nephron (The Guyton and Hall physiology)Maryam Fida
Structural and Functional unit of kidney is called nephron.
There are about 1.3 million nephron in each kidney.
New nephrons can not be regenerated by kidneys.
Functioning nephrons decrease about 10 % every 10 years at the age of 40.
At the age of 80, there are 40 % of functioning nephrons as compared to 40 yrs.
It is formed by two parts.
1. GLOMERULUS
2. BOWMAN’S CAPSULE
1- Glomerulus:
It consists of tuft of glomerular capillaries.
There is anastomosing & branching network of glomerular capillaries.
Glomerular capillaries have high hydrostatic pressure (nearly 60 mm Hg) as compared with other capillaries.
Glomerulus is surrounded by a membranous cover called Bowman’s capsule.
Each glomerulus is about 0.2 mm in diameter.
Glomerulus and Bowman’s capsule together constitute renal corpuscle.
Each renal tubule is divided into various part as they have different functions.
i- Proximal convulated tubule.
It is continuation of Bowman’s capsule.
ii- Loop of Henle. It is continuation of prox. conv. tubule.
* Loop of Henle has three parts.
a- descending limb,
b- u turn or bend in medulla and
c- ascending limb.
Ascending limb has initial thin segment followed by thick segment.
At the end of thick ascending limb, there is short segment called macula densa, which plays important role in controlling functions of nephron.
A nephron is the functional unit of the kidney responsible for filtering blood and forming urine. It consists of a renal corpuscle (containing the glomerulus and Bowman's capsule) and a renal tubule (composed of proximal convoluted tubule, loop of Henle, distal convoluted tubule, and collecting duct). Blood is filtered in the glomerulus, and the filtrate travels through the tubules, where reabsorption and secretion processes occur to regulate electrolyte balance and fluid volume.
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Excretory Products and their Elimination Class XI Biology Chapter 19.
Based on NCERT Class XI Biology Text book content.
Includes flowcharts and illustrations.
The current presentation includes the anatomy of nephron with neat labelled diagrams. The slide also includes the details of functions of each part of nephron.
Explain the role of the loop of Henlé in the formation of urine and .pdfarihantcommunication
Explain the role of the loop of Henlé in the formation of urine and how this is achieved
Solution
The renal cortex and renal medulla contain several nephrons that carryout the filtration of the
fluids and remove the wastes in the form of urine. The nephrons contain their renal corpuscles in
the cortex. The cortical nephrons consist of loop of Henle in the renal medulla near the junction
along with the renal cortex, while the loop of Henle of juxta-medullary nephrons is located in the
renal medulla. The cortical nephrons vary because some are superficial cortical nephrons and
some are midcortical nephrons, depending on location of renal corpuscle in the cortex.
The nephron loop is otherwise called as loop of Henle or loop of Hundle. It is U – shaped tube
extends from the proximal convoluted tube. The nephron loop consists of ascending and
descending limbs. The ascending limb is found in the renal cortex extends from proximal
convoluted tubule PCT into the renal medulla. The descending limb from renal medulla then
passes into the renal cortex and empties the content of distal convoluted tubule (DCT). The
nephron loop also performs the function of reabsorption of water and ions across the
concentration gradient. It has the primary function of concentrating the salts in the interstitium.
The proximal convoluted tubule (PCT) is divided into convoluted and straight parts of the
nephron. The PCT carries out the reabsorption of water, organic substances and some ions from
the original filtrate. The filtrate absorbs the water and solutes in PCT through the peritubular
capillaries. The organic solutes like glucose and amino acids are absorbed at PCT.
The distal convoluted tubule (DCT) carries out the reabsorption of water and sodium ions and
secretion under hormone stimulation. The distal convoluted tubule is different in structure and
function when compared to proximal convoluted tubule. Cells lining the tubule contain several
mitochondria to produce enough energy (ATP) for active transport of solutes.
The transport of the ions in the DCT is mediated by the activity of the endocrine system. The
DCT reabsorbs more calcium and secretes more phosphate in the presence of parathyroid
hormone. In the presence of aldosterone, more sodium is reabsorbed and potassium is secreted.
The atrial natriuretic peptide (ANP) stimulates the DCT to secrete more sodium. The DCT also
secretes hydronium and ammonium ions to regulate pH of the blood.
The collecting duct collects the tubular fluid across the osmotic gradient in the renal medulla.
Each collecting duct arises from the distal convoluted tubule and the filtrate is delivered to
collecting duct at the connecting tubule. The collecting duct starts in the renal cortex and extends
into the renal medulla. The urine is passed into collecting ducts by the medullary interstitium.
The urine passed into the collecting duct contains high sodium concentration because of the
counter current multiplier system in the loop of Hen.
Excretory Products And Their Elimination Class 11thNehaRohtagi1
Created By: NehaRohtagi1
Class 11th CBSE [NCERT]
Biology Chapter 17
Notes on the topic: Excretory Products And Their Elimination
For Class - 11th
I hope that you will found this presentation useful and it will help you out for your concept understanding.
Thank You!
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2. Nephron
Nephron, structural and functional unit
of the kidney. The word nephron is
derived from the Greek word nephros,
meaning kidney.
They are the microscopic structure
composed of a renal corpuscle and a
renal tubule. There are about millions of
nephrons in each human kidney.
The structure that actually
produces urine in the process of
removing waste and excess substances
from the blood.
3.
4. Structure of Nephron
The mammalian nephron is a long tube-like
structure, its length varying from 35–55 mm
long. At one end, the tube is closed, folded
and expanded, into a double-walled, a
cuplike structure called the Bowman’s
capsule or renal corpuscular
capsule, which encloses a cluster of
microscopic blood vessels called the
glomerulus. This capsule and glomerulus
together constitute the renal corpuscle.
The structure of nephron comprises two
major portions:
1) Renal Corpuscle.
2) Renal Tubule.
5. Renal Corpuscle
The renal corpuscle consists of a
glomerulus surrounded by a
Bowman’s capsule. The glomerulus
arises from an afferent arteriole and
empties into an efferent arteriole.
The smaller diameter of an efferent
arteriole helps to maintain high blood
pressure and increases the
hydrostatic pressure in the
glomerulus.
6. Glomerulus
The main function of
the glomerulus is to filter plasma to
produce glomerular filtrate, which
passes down the length of the
nephron tubule to form urine.
7. Bowman's capsule
Bowman's capsule surrounds the
glomerular capillary loops and
participates in the filtration of blood
from the glomerular capillaries.
Bowman's capsule also has a
structural function and creates a
urinary space through which filtrate
can enter the nephron and pass to the
proximal convoluted tubule.
8. Renal Tubule
The renal tubule is a long and convoluted
structure that emerges from the glomerulus
and can be divided into three parts based on
function.
The first part is called the proximal
convoluted tubule (PCT) due to its proximity
to the glomerulus; it stays in the renal cortex.
The second part is called the loop of Henle
or nephritic loop because it forms a loop
(with descending and ascending limbs) that
goes through the renal medulla.
The third part of the renal tubule is called the
distal convoluted tubule (DCT) and this
part is also restricted to the renal cortex.
9. Renal Tubule
The major function of tubules is
reabsorption and the process can
either be through active transport or
passive transport.
In addition, secretions by tubules
help in the urine formation without
affecting the electrolyte balance of the
body.
10.
11. Proximal Convoluted Tubule
(PCT)
Maximum reabsorption takes place in
PCT of the nephron. PCT is the region
of renal tubule where reabsorption of
essential substances like glucose,
proteins, amino acids, a major portion
of electrolytes and water takes place.
PCT selectively secretes ions such
as hydrogen, ammonia, and
potassium into the filtrate and absorbs
HCO3
– from it.
12. Proximal Convoluted Tubule
(PCT)
The proximal tubule efficiently
regulates the pH of the filtrate by
exchanging hydrogen ions in the
interstitium for bicarbonate ions in the
filtrate; it is also responsible for
secreting organic acids, such as
creatinine and other bases, into the
filtrate.
Thus, PCT maintains the electrolyte
and acid-base balance of the body
fluids.
13. Loop of Henle
Loop of Henle has a descending and an
ascending limb. Being parts of the same loop,
both the descending and ascending limbs
show different permeability. The descending
limb is permeable to water but
impermeable to an electrolyte, while the
ascending limb is permeable to
electrolytes but impermeable to water.
Since the electrolytes get reabsorbed at the
ascending loop of Henle, the filtrate gets
diluted as it moves towards the ascending
limb. But reabsorption is limited in this
segment.
14. Distal Convoluted Tubule
(DCT)
Similar to PCT, DCT also secretes
ions such as hydrogen, potassium,
and NH3 into the filtrate while
reabsorbing the HCO3
–from the
filtrate. Conditional reabsorption of
sodium ions and water takes place in
DCT.
It plays a critical role in a variety of
homeostatic processes and
maintains the pH and sodium-
potassium level in the blood cells.
15. Collecting Duct
Collecting duct is a long, straight tube
where H+ and K+ ions are secreted
to maintain the electrolyte balance of
the blood. This is also the region
where the maximum reabsorption of
water takes place to produce
concentrated urine.
Renal collecting tubule collects urine
from the nephrons and moves it into
the renal pelvis and ureters.