Urine And Sweat-Excretory Products
Skin gives out sweat formed from salt water. Sweat glands produce sweat. It passes through sweat ducts which are finally excreted through sweat pores.
The excretory system helps in the removal of waste products, produced as a result of vital activities carried out in our body.
In the waste products stay in our body, they are harmful to our body. Therefore they are eliminated. Suck waste materials which are not required by our body are called excretory products.
Kidneys, lings and skin are the main excretory organs which aid in the elimination of excretory products containing nitrogenous materials.
Let know the excretory organs and the products eliminated by them.
Location of kidneys in man: In the abdominal cavity of our body, there are two kidneys, one on each side of the vertebral column towards the backside of the body.
Color and shape: They are reddish brown in color and bean shaped.
Internal structure of kidney: Numerous tiny tubules, called nephrons are present in kidneys.
Function of nephrons: They filter the blood and separate the impurities which are dissolved in water and excreted as urine.
The mechanism of urine excretion: After the urine is formed in the kidneys, it reaches urinary bladder through the ureters. This urine is stored in the bladder till it is full. The muscles of the bladder contracts and urine as a waste product is excreted though an external opening, urethra.
Among summer, rainy and winter seasons, in whish seasons the excretion of urine is more? In which season the excretion of urine is less. Why?
Lungs: They eliminate carbon dioxide and water vapor. This we can observe by blowing our air on a glass slide with mouth or nose.
Skin structure: we find hairs, sweat pores, sweat glands, etc., in the longitudinal section of the skin.
1) Function of sweat glands: They collect the impurities from blood and sweat is prepared.
2) Function of sweat duct and pores: The sweat formed passes through the duct and is excreted through sweat pores.
3) We find more sweat in summer and also when we run fast and do brisk action. Skin gives out more sweat. Why.
4) Purpose of sweating: Skin cools the body temperature by sweating. We understanding that skin excrete salt and water in the form of sweat through sweat pores. They are nothing but the opening of sweat glands continued as sweat.
A) The impurities, formed in the process of vital activities must be excreted.
B) The system excreting is called renal system.
C) Nephrons filter the impurities which are dissolved in water to form urine. Urine is formed from urea, uric acid, certain gasses and water.
D) Carbon dioxide and water vapor are excreted by lungs.
E) Skin gives out sweat formed from salt water. Sweat glands produce sweat. It passes through sweat ducts which are finally excreted through sweat pores.
F) The delicate and vital parts like heart, lungs and brain are protected by the skeleton.
G) The muscles present in our body help in different movements. More than 600 muscles are found in our body.
H) Take skin care, do daily bath wash clean with soap.