Biology
The following diagram represents a mammalian kidney tubule (nephron) and its blood supply.
Parts indicated by the guidelines 1 to 8 are as follows:
- Afferent arteriole from renal artery
- Efferent arteriole
- Bowman's capsule
- Glomerulus
- Proximal convoluted tubule with blood capillaries
- Distal convoluted tubule with blood capillaries
- Collecting tubule
- U-shaped loop of Henle
Study the diagram and answer the questions that follow:
(a) Where does ultrafiltration take place?
(b) Which structure contains the lowest concentration of urea?
(c) Which structure contains the highest concentration of urea?
(d) Which structure (normally) contains the lowest concentration of glucose?
(e) Where is most water reabsorbed?
(f) State the reason for the high hydrostatic pressure in the glomerulus.
(g) Name the part of the nephron which lies in the renal medulla.
Excretory System
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Answer
(a) Ultrafiltration takes place in Glomerulus (marked as 4 in the diagram).
(b) Efferent arteriole (marked as 2 in the diagram) contains the lowest concentration of urea.
(c) Afferent arteriole (marked as 1 in the diagram) from renal artery contains the highest concentration of urea.
(d) Collecting tubule (marked as 7 in the diagram) contains the lowest concentration of glucose.
(e) Most water is reabsorbed in Proximal convoluted tubule with blood capillaries (marked as 5 in the diagram).
(f) The efferent arteriole is narrower than the afferent arteriole. This creates a high hydrostatic pressure in the glomerulus.
(g) Loop of Henle is the part of the nephron which lies in the renal medulla.
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Related Questions
Given alongside is the figure of certain organs and associated parts in the human body. Study the same and answer the questions that follow:
(a) Name all the organ-systems shown completely or even partially.
(b) Name the parts numbered 1 to 5.
(c) Name the structural and functional unit of the part marked '1'.
(d) Name the two main organic constituents of the fluid that flows down the part labelled '3'.
(e) Name the two major steps involved in the formation of the fluid that passes down the part labelled '3'.
The figure given below represents a kidney tubule in humans and its blood supply. Study the figure and answer the questions that follow. Write specific name and numbers shown in the diagram for each answer.
(a) Name the part which consists of a knot-like mass of blood capillaries.
(b) What is the specific name for the combination of parts shown as 5 and 3?
(c) Name the part which collects the glomerular filtrate.
(d) Where is the most water reabsorbed?
(e) Name the part which collects urine in the diagram shown.
(f) Which part lies in the medulla of the kidney?
(g) Which of the above parts is involved in the process of tubular secretion?
(h) How is hydrostatic pressure created?
(i) Where does ultrafiltration take place?
(j) Name two important constituents of urine.
Given alongside is a simplified diagram of the human kidney cut open longitudinally. Answer the questions that follow:
(a) Define excretion.
(b) Why does the cortex of the kidney show a dotted appearance?
(c) Why does the medulla of the kidney show a striped appearance?
(d) Write two differences in composition of the blood flowing through the blood vessels, 'A' and 'B'.
Study the diagram given alongside and then answer the questions that follow:
(a) Name the region in the kidney where the above structure is present?
(b) Name the parts labelled 1, 2, 3, and 4.
(c) Name the stages involved in the formation of urine.
(d) What is the technical term given to the process occurring in 2 and 3? Briefly describe the process.