Class 11 Biology Excretory Products Elimination Nephrons

Nephrons

 

Nephrons are the functional units of kidneys. Each nephron acts as a microfilter.

 

Structure of a Nephron

Nephrons are tubular structures. Each nephron consists of 2 parts:

  • Glomerulus
    • Network of very thin-walled blood capillaries
    • Afferent arteriole brings blood into glomerulus
    • Efferent arteriole drains blood out of glomerulus

               

  • Renal tubule

Renal tubule has the following parts:

  • Bowman’s capsule
    • Double-walled epithelial cup-shaped structure
    • Encloses Glomerulus
    • Located in cortical region of kidney
  • Proximal Convoluted Tubule
    • Highly coiled tubular structure
    • Located in cortical region of kidney
  • Henle’s loop
    • Descending & Ascending limb
    • Located in medulla of kidney
  • Distal Convoluted Tubule
    • Highly coiled tubular region extending from Henle’s ascending loop
    • Located in cortical region of kidney
  • Collecting Duct
    • Straight tubular structure into which multiple DCTs open
    • Extends from cortex to inner parts of medulla

Multiple collecting ducts open into Renal pelvis

 

Class_11_Biology_Excretory_Products_their_Elimination_Collecting_Duct

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