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प्रश्न
Give reason:
Excretion is a necessary process of our body.
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उत्तर
- Our bodies need to excrete urea, an extremely toxic nitrogenous waste product.
- Excessive accumulation in the bloodstream can result in death.
- The excretory substances include carbon dioxide (CO2) and water (H2O), nitrogenous metabolic waste, excess salts, and bile pigment.
संबंधित प्रश्न
Describe the structure of nephrons.
The diagram given below shows a section of human kidney. Study the diagram carefully and answer the questions that follow :
(i) Label the parts numbered 1 to 4.
(ii) Why does part ‘2’ have a striped appearance?
(iii) What is the fluid that passes down part ‘4’? Name the main nitrogenous waste present in it.
(iv) Mention the structural and functional units of kidneys.
(v) Name the two major steps in the formation of the fluid mentioned in Q.5 (a) (iii).
Name the main nitrogenous waste in the human blood. How is it removed from the blood?
Draw a neat labelled diagram of the human excretory system.
In which of the following are the largest amounts of nitrogen excreted from a mammalian body?
(a) breath
(b) sweat
(c) urine
(d) faeces
The organs A of a person have been damaged completely due to which too much of a poisonous waste material B has started accumulating in his blood, making it dirty. In order to save this person's life, the blood from an artery in the person's arm is made to flow into long tubes made of substance E which are kept in coiled form in a tank containing solution F. This solution contains three materials G, H and I in similar proportions to those in normal blood. As the person's blood passes through long tubes of substance E, most of the wastes present in it go into solution. The clean blood is then put back into a vein in the arm of the person for circulation.
(a) What are organs A?
(b) Name the waste substance B.
(c) What are (i) E, and (ii) F?
(d) Name G, H and I.
(e) What is the process described above known as?
Study the diagram given alongside and then answer the question that follow:
Name the stages involved in the formation of urine.
Given below is a simple diagram of the human kidney cut open longitudinally. Answer the following questions:
c
(v) Write two differences in the composition of the blood flowing through blood vessels A and B.
Name the Following
The process by which kidneys regulate the water content of the body.
Which of the following is not an example of secretion?
