Question

Number of nephrons in each kidney of man is
A. 0.7 million
B. 0.9 million
C. 1.2 million
D. 1.6 million

Answer 1

Hint: There is a pair of kidneys present in humans. Kidney is the bean shaped organ that is present behind the belly, below the ribs and on either side of the spine in humans. The function of the kidney is to remove the waste of the blood.

Complete Answer:
Nephrons: Nephrons are the functional unit of kidneys. Nephron is a microscopic structure.
- Each nephron is composed of a renal corpuscle and a renal tubule.
- The renal corpuscle consists of a network of capillaries which is called as glomerular and glomerulus is present inside the Bowman’s capsule. Bowman’s capsule is a cup like structure into which filtration take place.
- The renal tubule extends from the Bowman’s capsule. As the fluid moves from the capsule to the renal tubule, reabsorption and exchange of many ions take place.
- An adult human contains approx 1.2 million nephrons in each kidney. The work done by the nephrons .
- After processing, at the end of the tubule, the remaining fluid is called urine. The urine is composed of water, metabolic wastes and toxins.

 The nephrons use four steps in order to produce urine.
1. Filtration
2. Reabsorption
3. Secretion
4. Excretion
The urine gets stored in the urinary bladder till its excretion from the body.

So, option C is the correct answer for this question.

Note: When the nephrons do not get enough blood they get damaged and cannot filter the wastes from the blood. As a result toxins and metabolic wastes cannot leave the body and accumulate in the body.