Question

With the help of labelled diagram of human excretory system. Mention its important parts and explain them?

Answer 1

the Main organs of excretion in vertebrates are the KIDNEYS. these are two reddish brown bean shaped structures situated towards the back of the abdominal cavity just above the waist. each kidney has a concavity , hilus on its inner surface through which a narrow tube ureter passes out to the urinary bladder. the urinary bladder is a thin walled muscular bag.the bladder is a tube urethra which runs down and opens outside through the urinary opening.


EXTERNAL STRUCTURE OF KIDNEY.

the longitudinal section through the kidney shows three main parts.

CORTEX:it is peripheral darker position.
MEDULLA:it is inner lighter portion having comical projection called pyramid.
PELVIS: pelvis is the enlarged position of the ureter inside the kidney.


INTERNAL STRUCTURE OF KIDNEY
internal structure of kidney consist of more than a million number of tubules which are known as nephrons .

BOWMAN'S CAPSULE : it is a double walled up it is having a bunch of capillaries, the glomerulus .the bowman's capsule and the glomerulus together form renal corpuscle also known as malpighian body.

RENAL TUBULES : this is the second part of nephrons . it is differentiated into three regions.

* the proximal convoluted tubule
*the distal convoluted tubule
*loop of iienle

COLLECTING DUCT: the renal tubule opens into the collecting ducts .these collecting ducts opens into the cups like structure of the pelvis.


EXTRA INFORMATION

human kidney is 12cm in length and 6cm in width and 3cm thickness. kidney not only functions as the excretory organ but also regulated water and salt balance in the blood.


☺HOPE IT WILL HELP YOU☺

Answer 2

Hey there,

PARTS OF URINARY SYSTEM :-

Kidneys :-
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are the two organs at the back of the body, just below the ribs. They are the main organs of excretion, filtering out unwanted substances from the blood and regulating the level and contents of body fluids, Blood enters a kidney in a rental artery and leaves it in a renal vein.

ureters:-
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The two tubes which carry urine from the kidneys to the bladder.

Bladder or urinary bladder:-
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A sac which holds stored urine. it's lining has many folds which flateen out as it fills up, letting it expand.

Urethra :-
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The tube carrying urine from the bladder out of the body. In men, it also carries sperm. The expulsion of urine is called urination or micturition.

INSIDE A KIDNEY :-

Nephrons :-
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The tiny filtering units of the kidneys ( there are about 1 million per kidney ) . Each consists of a renal corpuscle and a uriniferous tubule.

Real corpuscles or Malpighian corpuscles
The bodies which filter fluids out of the blood . Each consists of a glomerulus and a Bowman's capsule.

Glomerulus :-
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A ball of coiled-up capillaries ( tiny blood vessels ) at the centre of each renal corpuscles. The capillaries branch from an arteriole entering the corpuscle and re - unite to leave the corpuscle as an efferent arteriole.

Bowman's capsule :-
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The outer part of each renal corpuscle. It is a thin-walled sac around the glomerulus.

uriniferous tubules or renal tubules
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long tubes each one leading from a Bowman's capsule.

Each has three main parts: -

» the proximal convoluted tubule
» the loop of henlé and
» the distal convoluted tubule - and has many capillaries ( tiny blood vessels ) twined around it. These are branches of the efferent arteriole and they re-unit to form larger blood vessels carrying blood away from the kidney.

Collecting duct or collecting tubule
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A tube which carries urine from several uriniferous tubules into pelvis of a kidney.


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BEST OF LUCK ;-)

#akashmandal.