With the help of the labelled diagram, describe how the human body gets rid of its wastes through excretion.
(5 marks)
Answers
Answer:
Excretion in human beings:
Although the kidneys are the main organs of excretion, the skin, lungs and liver also help in excretion.
Skin:
Our skin has sweat glands, through which we excrete small amounts of water, urea and salts.
Liver:
The liver excretes bile, which contains bile pigments. These are produced by the breakdown of old RBCs in the liver. As hemoglobin breaks down, its iron is retained, while the pigment (haem) is excreted with the bile. The liver also excretes cholesterol.
Lungs:
The lungs help in getting rid of carbon dioxide, formed as a result of cellular respiration, through exhalation.
Excretory System in Man:
Our excretory system consists of kidneys, blood vessels that join them, ureters, urinary bladder and urethra. They help produce and excrete urine.
There are two bean-shaped kidneys that lie in the abdominal cavity, one on either side of the vertebral column. The kidneys are reddish brown. Each of them is about 10 cm long and weighs about 150 g. Although they weigh less, they receive a lot of blood for filtration.
A volume of blood nearly equivalent to that in the whole body passes through the kidneys every four or five minutes. The kidneys produce urine to filter out the waste products, like urea and uric acid, from the blood.
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Answer:
Explanation:
we eat, the mouth grinds the food and is passed to the stomach through he esophagus. after that it is passed down to the small and large intestine. then, the body gets rid of the waste in the form of stool
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