Multiple choice

Nephron is the basic functional unit of __________.

  1. lungs

  2. kidneys

  3. testis

  4. ovaries
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B Correct answer
Explanation

Nephron is the basic functional unit of kidneys. Each human kidney possesses about one million structural and functional units called nephrons.

 Lungs are the respiratory organs. These are vascularized bags, which are used by organisms for exchange of gases, i.e. Carbon dioxide and oxygen. The basic functional unit of lungs is alveolus (also called air sacs). These alveoli are thin walled. The wall of the alveoli has an extensive network of blood capillaries. Due to intimate contact of blood capillaries with the alveoli, the exchange of gases takes place easily. Thus, each alveolus may be called as a miniature lung, where exchange of gases takes place. Ovaries and testis are the female and male reproductive organs, respectively.

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