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प्रश्न
Name the main nitrogenous waste in the human blood. How is it removed from the blood?
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उत्तर
The main nitrogenous waste in the human blood is urea. The kidneys remove the urea from the blood and excrete them in the form of a dilute solution called urine.
Kidneys are the main excretory organ of the human body. There are millions of nephrons in each kidney. Each nephron contains a renal corpuscle and a renal tubule. The renal corpuscle consists of capillaries called the glomerulus, enclosed by a capsule called Bowman's capsule. The blood is filtered in the glomerulus and the filtrate travels through the renal tubules. Here, the materials needed by the body are reabsorbed, while the wastes (like urea) are collected and excreted in the urine.
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संबंधित प्रश्न
Match structures given in Column I with functions given in Column II.
| Column I | Column II | ||
| (i) | Stomata | (a) | Absorption of water |
| (ii) | Xylem | (b) | Transpiration |
| (iii) | Root hairs | (c) | Transport of food |
| (iv) | Phloem | (d) | Transport of water |
| (e) | Synthesis of carbohydrates |
Name the Following
The organ which produces urea.
Bile, Urea, Uric acid, Ammonia
The nephrons discharge their urine at ______.
_____________ secreted by the (ii) _____________ lobe of the pituitary gland. If this hormone secretion is reduced, there is an increased production of urine. This disorder is called (iii) ____________. Sometimes excess glucose is passed with urine due to hyposecretion of another hormone called (iv) _____________ leading to the cause of a disease called (v) ______________.
The diagram given below shows the male urinogenital system of a human being. Study the diagram and answer the questions that follow:
(i) Label the parts numbered 1 to 8.
(ii) Name the corresponding structure of part (4) in female reproductive system.
(iii) What is the role of part 7?
Write the functions of Kidney
Write the functions of Ureter.
Name the following:
The vein in which urea concentration is maximum
Differentiate between the following pairs of term :
Renal cortex and renal medulla
Given below is a diagram of a human kidney, cut open longitudinally. Answer the following:
(i) Give definition of excretion.
(ii) Name the unit of kidney.
(iii) Why does the cortex of kidney show dotted appearance?
(iv) List the functions of the kidney.
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.
Give Technical Terms
The hormone that helps increase the reabsorption of water from the kidney tubules.
Choose the Odd One Out:
Answer the following question.
Amphibian tadpole can afford to be ammonotelic. Justify.
The habitat of animals that excrete nitrogenous waste in the form of urea.
Elimination of nitrogenous wastes in the form of uric acid takes place in ____________.
Plants use completely different process for excretion as compared to animals. Which one of the following processes is NOT followed by plants for excretion?
In a person the tubule part of the nephron is not functioning at all. What will its effect be on urine formation?
Which of the following is not an example of secretion?
