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प्रश्न
Explain in your own words with suitable examples.
How does excretion occur in human beings?
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उत्तर
- The excretory system removes wastes from the body, which is an important function.
- The human excretory system is made up of two kidneys, two ureters, the urine bladder, and the urethra. The kidneys produce urine by removing waste and undesirable chemicals from the bloodstream.
- Nephrons are the functional units of the kidney that perform the basic function of filtration. The urea generated in the liver enters the bloodstream.
- When urea-containing blood enters the glomerulus, it is filtered by capillaries, removing urea and other related compounds.
- Water molecules and tiny molecules of other substances can pass through the semipermeable membrane of Bowman's capsule.
- The fluid that has accumulated in the Bowman's capsule cavity enters the nephron's tubular portion. Here, water molecules and other important compounds are reabsorbed into the bloodstream.
- Urine is generated from the residual fluid, which contains waste elements. The ureters carry urine, which is then stored in the urinary bladder. Urine is then released through the urethra.
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संबंधित प्रश्न
Correct the following statements by changing the underlined words:
The normal pale yellow colour of the urine is due to the presence of the pigment Melanin.
Name the two parts of a plant through which its gaseous waste products are released into the air.
What is the name of the tubes which connect the kidneys to bladder?
With which human organ system (or human systems) is the glomerulus associated?
Name the main nitrogenous waste in the human blood. How is it removed from the blood?
If a patient is out on dialysis, he is most likely suffering from a severe ailment of the ______.
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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. |
- What are organs A?
- Name the waste substance B.
- What are (i) E, and (ii) F?
- Name G, H and I.
- What is the process described above known as?
Tick the most appropriate answer.
The process of removing waste from the body is called
Fill in the blank.
.................. produces bile pigments from the heamoglobin of broken RBCs.
Answer the following in detail.
Explain the process of transpiration. Describe some factors that affect it.
Name the following:
The part of kidney tubules where the term urine is first used for the fluid in it.
Differentiate between the following pairs of term :
Renal pelvis and renal papilla
What is dialysis? Under what condition is it carried out?
Given below is a simplified diagram of the human kidney cut open longitudinally. Answer the questions that follow.
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- Define excretion.
- Why does the cortex of the kidney show a dotted appearance?
- Why does the medulla of the kidney show a striped appearance?
- Write two differences in the composition of the blood flowing through the blood vessels 'A' and 'B'.
Study the diagram given alongside and then answer the question that follow:
Name the region in the kidney where the above structure is present?
Correct and rewrite the statements by changing the biological term that is underlined for the statement:
The kidney is composed of number of neurons.
Complete the following sentence with appropriate word:
The U-shaped portion of a nephron located in the medulla region is called ______.
Write the functional activity of the following structure: Henle’s loop
Answer the following question.
Amphibian tadpole can afford to be ammonotelic. Justify.
