Question

what are nephrons? write the functions of nephron tubules in urine formation 4 marks​

Answer 1

Answer:

Structural and functional unit of kidney is called nephron or uriniferous tubule.

Selective reabsorption

 Out of 180 liters of filtrate formed every day 178.5 liters along with useful materials reabsorbed into

the blood through peritubular capillaries leaving 1.5 liters excreted in the form of urine.

 The tubular epithelial cells of different segments of nephron perform these either active or passive

mechanisms.

 Substance like glucose, amino acids Na+ absorbed actively.

 Nitrogenous wastes are absorbed by passive transport.

 Reabsorption of water also occurs passively in the initial segments of the nephron.

Tubular secretion

 The tubular cells adds substances like H+ , K+ and ammonia to the filtrate from the peritubular

capillaries.

 Tubular secretion maintains ionic and acid base balance of the body fluids.

Answer 2

Answer:

The fundamental structural and functional unit of a kidney is a nephron. More than 8 lakh nephrons are present in each human kidney.

Explanation:

• Renal corpuscles and kidney tubules, often known as renal tubules, make up a nephron.
• The nephron is the organ responsible for producing urine during waste expulsion.
• It is carried out as part of the process of eliminating waste and extra chemicals from the blood.
• The average human kidney contains one million nephrons.
• Blood filtration, water reabsorption, and other crucial smaller molecules from the ultrafiltrate are among the nephron's primary tasks. The secretion of glutamate by the nephron is a crucial additional function.
• The kidney's operation is a crucial nephron function.
• A unique set of capillaries found in the nephron contributes to the kidney's proper operation.
• The kidney is only fully grown and functional in vertebrates.

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