Question

write a short note on Human excretory system​

Answer 1

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The excretory system is a passive biological system that removes excess, unnecessary materials from the body fluids of an organism, so as to help maintain internal chemical homeostasis and prevent damage to the body. The dual function of excretory systems is the elimination of the waste products of metabolism and to drain the body of used up and broken down components in a liquid and gaseous state. In humans and other amniotes(mammals, birds and reptiles) most of these substances leave the body as urine and to some degree exhalation, mammals also expel them through sweating.

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Answer 2

Answer :

Excretory System :  

o The biological process of removal of harmful nitrogenous metabolic waste from the body is called excretion .

o It involves elimination of wastes like ammonia,urea,uric acid .

1. Ammonotelism : The process of excretion of ammonia is called ammonatelism .It is higher toxic so needs more water for excretion.

2. Ureotelism : The process of excretion of urea called ureotelism . it is less toxic  

3. Uricotelism : The process ofexcretion of uric acid is called uricotelism.It is least toxic . it is insoluble in water,so water is not required for excretion

Excretion in human being :  

o A pair of kidneys , a pair of ureters ,a urinary bladder and a urethra constitutes the human excretory system.

o Kidneys are present on either side of the backbone in the abdomen.

o Kidneys produce urine and urine from kidney passes through the ureter into the urinary bladder and remains stored their until it is released through the urethra.

o Substances like glucose , amino acids , salts and a major amount of water is selectively reabsorbed from the intial filtrate as the urine flows along the tube.

o Reabsorption depends on the amount of excess water in the body and dissolved waste to be excreted.

o The urine from kidneys enters the long tube called ureter  

o Ureter connects the kidney with the urinary bladder and urine from the kidney is passed to urinary bladder and stored in the bladder .

o when the bladder pressure in the expanded bladder leads the urge to urinale , the urinc is passed out through urether