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प्रश्न
Describe the T. S. of thyroid gland
Sketch and label T.S. of the thyroid gland.
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उत्तर
Thyroid gland is externally covered by connective tissue sheath or capsule.
From the capsule, number of septa called trabeculae arise, which divide the thyroid gland into
several lobules. The lobules contain about 3 million thyroid follicles. Each thyroid follicle is oval in shape and varies in size. Larger follicles are present towards periphery, whereas smaller ones are present in the interior. The follicles are surrounded by a connective tissue called interfollicular tissue which contains blood vessels and nerve fibres.Each follicle is lined by a single layer of cuboidal glandular epithelium which rest on a very thin
basement. The follicular cavity or acinus is filled by dense amorphous semisolid substance called colloid, which is thyroglobulin, a precursor of thyroid hormone, thyroxine. Other cells bigger than follicular cells are also present singly or in groups in the connective tissue.
These are called parafollicular or ‘C’ cells.
They secrete hormone thyrocalcitonin.
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संबंधित प्रश्न
Which parts of the alimentary canal produce hormones?
Differentiate: Insulin and Glucagon.
Differentiate: Acromegaly and Myxoedema.
Give the Technical Term: What are releasing hormones?
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Hormones are produced by endocrine gland.
Study the diagram given below and then answer the questions that follow:
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- Name the cells of the pancreas that produce (1) glucagon (2) insulin.
- State the main function of (1) glucagon and (2) insulin.
- Why is the pancreas referred to as an exo-endocrine gland?
- Why is insulin not given orally but is injected into the body?
- What is the technical term for the cells of the pancreas that produce endocrine hormones?
- Where in the body is the pancreas located?
Choose the Odd One Out
Hormones are known as chemical messenger. Justify.
Growth hormone is important for normal growth. Justify the statement.
Label the endocrine glands in the given figure.
