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Chemical Coordination and integration — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYChemical Coordination and integration3 Marks
Question
  1. Where is thyroid gland located in our body? Briefly describe its structure.
  2. Write the cause of cretinism. Mention any four symptoms of this disorder.
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Answer

  1. Thyroid gland:
  • It is composed of two lobes, which are located on either side of the trachea.
  • The two lobes are interconnected by a thin flap of connective tissue, called isthmus.
  • The thyroid gland is composed of follicles and stromal/ parafollicular tissue.
  • Each follicle is composed of follicular cells, arranged with a central cavity.
  1. Cretinism:
  • It is caused by hypothyroidism of mother during pregnancy that leads to defective development and maturation of the growing foetus:

Symptoms:

  • Stunted growth.
  • Mental retardation.
  • Low intelligence quotient.
  • Deaf-mutism.
  • Abnormal skin.

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