Q. 113.9( 8 Votes )

What is the difference between excretion and defecation? Explain the process of excretion in humans.

Answer :

Excretion is the removal of nitrogenous waste products of metabolism that are formed in the body, such as urine and carbon dioxide through kidneys and lungs. It is a part of excretory system.

Defecation (discharge of faeces) refers to the removal of undigested food and other waste material from the alimentary canal through the anus. It is a part of digestive system. It marks the end of digestion.

Human excretory system

● It consists of a pair of kidneys, a pair of ureters, a urinary bladder and a urethra.

● Urine is produced in the kidneys and passed to the urinary bladder through the ureters.

● It is then excreted out of the urinary bladder via urethra.

● Each kidney possesses about a million nephrons (basic functional unit) that are responsible to filter out blood and produce urine.

● The three processes involved are filtration, re-absorption and secretion.

● Certain substances such as glucose and amino acids are re-absorbed while other waste products are excreted out in the form of urine, which is carried by ureters from the kidney to the urinary bladder.

● Thus, help to concentrate the urine.

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