which of the following statements is not correct ?
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The human kidney has about 1 million nephridia is an incorrect statement. (option c)
The Human Kidney
- The kidney is the main excretory organ of human beings.
- It is retroperitoneal (behind the peritoneum) and bean-shaped.
- We have 2 kidneys, each of which is divided into the cortex and medulla.
- The functional unit of the kidney is the nephron.
- Each kidney has about 1 million nephrons.
What is Nephridia?
- Nephridia is the organ of excretion and osmoregulation in Annelids (earthworms, leeches, etc,).
- In the cardiac cycle, deoxygenated blood is poured into the right atrium. From there, it is emptied into the right ventricle, which pumps it back to the lungs.
- Flatworms (Platyhelminthes) have specialized structures called flame cells for osmoregulation and excretion.
- Mature tracheids and vessels lack protoplasm. Hence, they are said to be non-living conducting tissue.
Therefore, option (c) Human kidney has about 1 million nephridia is wrong.
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