draw a well labelled diagram of
nephron and explain the process of filteration of urine.
Answers
The filter unwanted substance from the blood produce urine to the excrete them . There are three main steps of urine formation: Glomerular filtration reabsorption and secretion . These processes ensure that only waste and excess water are removed from the body
Answer:
The two bean-shaped kidneys are situated one on either side of the vertebral column. on the posterior side of abdomen. The functional unit of the kidney that performs the basic function of filtration called a nephron. Each nephron has a cup-like, thin-walled upper part called the Bowman's capsule. The network of capillaries in it is called a glomerulus. The urea produced in the liver comes into the blood. When the urea-containing blood comes into the glomerulus, it is filtered through its capillaries and urea and other similar substances are separated from it.
Water molecules and small molecules of some other substances can cross the semipermeable membrane of Bowman's capsule. The solution accumulated in the cavity of 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. Urine is formed from the remaining solution which is full of waste materials. The urine is carried by the ureters and stored in the urinary bladder. Afterwards, urine is given out through the urethra. The urinary bladder is muscular and it is under the control of nerves. Hence, we are able to keep a control on urination. Though the kidneys are the main organs of excretion in human beings, the skin and lungs also help in the process of excretion.
The right kidney is in a slightly lower position than the left. Each kidney has
approximately 10 lakh nephrons. The approximately 5 litre of blood which is present in a normal healthy person's body is filtered by the kidneys about 400 times every day. Thus, every day, the kidneys filter about 190 litres of blood from which about 1 to 1.9 litres of urine is formed. The remaining liquid is reabsorbed.
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