Write short note:-
how does excretion occur in human being
Answers
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1. Removal of waste from the body is very important and it is the excretory system that carries out this function.
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2. The human excretory system consists of a pair of kidneys,a pair of ureters ,the urinary bladder and the urethra.
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3.Urine is formed by the kidneys by the sperating the waste and unwanted excess substances from the blood.
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4. The functional unit of the kidney that performs the basic unit of filtration is called as nephron. The urea produced in the liver comes in to the blood.
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5. When the urea containing the blood comes into the Glomerulus,it is filtered through capillaries and urea and other similar substance are separated from it.
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6. Water molecules and small molecules of some other substances can cross the semi permeable membrane of Bowman's capsule.
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7. The solution accumulated in the cavity of the Bowman's capsule passes into the tubular part of the nephron. Here, molecules of water and some other useful substances are reabsorbed into the blood.
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8. Urine is formed from the remaining solution which is full of waste materials.The urine is carried by the ureters and store in the urinary bladder. Afterwards, urine is given out through the urethra.
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HOPE THIS HELPS YOU!!! ^_^
Answer:
The removal of waste products from the body is known as excretion. In the human body, kidneys, lungs and skin perform the function of excretion. Lungs remove carbon dioxide as waste. Skin helps in the removal of waste in the form of sweat. However, the major organ involved in excretion is the urinary system, which contains the kidneys to filter the blood and form urine.
In human beings, excretion is performed by the excretory system consisting of a pair of kidneys, a pair of ureters, a urinary bladder and urethra.
The urine is formed in kidneys and passes on to the urinary bladder via the ureters. The urinary bladder stores the urine until it is excreted through the urethra.
The kidney contains numerous filtration units called the nephrons. Nephron is the structural and functional unit of the kidney. The nephrons consist of a network of capillaries associated with a cup-shaped end of a tube in which the filtered urine is collected. When the blood passes through the tube, some substances such as glucose, amino acids, salts, and water are selectively reabsorbed. The final filtrate is collected in the collecting tubule and eventually enters the ureters.
