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Question
The diagram given alongside shows a section of a human kidney. Study the diagram carefully and answer the questions that follow:
- Label the parts numbered 1 to 4.
- Why does part 2 have a striped appearance?
- What is the fluid that passes down part 4? Name the main nitrogenous waste present in it.
- Mention the structural and functional units of kidneys.
- Name the two major steps in the formation of the fluid mentioned in (c).
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Solution
- 1: Cortex
2: Medulla
3: Pelvis
4: Ureter - Medulla is composed of a striped substance arranged in several pyramids. Hence, the medulla (b) has a striped appearance.
- Urine passes down part ‘4’, i.e., the ureter. The main nitrogenous substance present in it is urea.
- Nephrons are the structural and functional units of the kidneys.
- The two major steps in the formation of urine are ultrafiltration and selective reabsorption.
RELATED QUESTIONS
The given diagram represents a nephron and its blood supply. Study the diagram and answer the following questions:
(i) Label parts 1, 2, 3 and 4.
(ii) State the reason for the high hydrostatic pressure in the glomerulus.
(iii) Name the blood vessel which contains the least amount of urea in this diagram.
(iv) Name the two main stages of urine formation.
(v) Name the part of the nephron which lies in the renal medulla.
Name the two parts of a plant through which its gaseous waste products are released into the air.
In which of the following are the largest amounts of nitrogen excreted from a mammalian body?
Fill in the blank.
....................... are present in the stem of pine tree that make the pinewood strong and durable.
Choose the correct answer:
Narrow apex of pyramid in kidney is called ___________
The following diagram represents a mammalian kidney tubule (nephron) and its blood supply.
Parts indicated by the guidelines 1to 8 are as follows:
1. Afferent arteriole from renal artery
2. Efferent arteriole
3. Bowman's capsule
4. Glomerulus
5. Proximal convoluted tubule with blood capillaries
6. Distal convoluted tubule with blood capillaries
7. Collecting tubule
8. U-shaped loop of Henle
Study the diagram and answer the question that follow:
Where is most water reabsorbed ?
Describe in brief how urine is produced in the human body.
Give Technical Terms
The hormone that helps increase the reabsorption of water from the kidney tubules.
Osmoregulation maintains the osmolarity of blood at about ______.
Identify the correct labels for A and B in the following diagram
