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प्रश्न
Where is the thymus gland located and what is its function?
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उत्तर
The thymus gland is located in the mediastinum in front of the heart. This secretes a hormone thymosin which stimulates the lymphocytes to destroy invading microorganisms and antigens. It degenerates on aging, decreasing the immunity in old age.
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संबंधित प्रश्न
match the conditions in column A with the cause in column B.
| A (Condition) | B (Cause) | ||
| a | Dwarfism and mental retardation | 1 | shortage of glucose in blood |
| b | Diabetes mellitus | 2 | Over secretion of growth hormone |
| c | Excess of glucose in blood | 3 | Insulin shock |
| d | Gigantism | 4 | Over secretion of thyroxine |
| e | Enlargement of breasts in adult males | 5 | Hypothyroidism |
| f | Exophthalmic goitre | 6 | Over secretion of cortical hormones |
Given below is a table designed to give the names of the glands, the hormones produced, their chief functions, the effects of oversecretion and undersecretion in respect of thyroid, pituitary and pancreas. Fill up the blanks 1–13.
| S.No. | Source Gland cells | Hormone produced | Chief function | Effect of oversecretion | Effect of undersecretion |
| 1 | (1) ______ | Thyroxine | (2) ______ | (3) ______ | (4) ______ |
| 2 | Beta cells of Islets of Langerhans | (5) ______ | Promotes glucose utilisation by the body cells | (6) ______ | (7) ______ |
| 3 | (8) ______ | Growth hormone | (9) ______ | (10) ______ | Dwarfism |
| 4 | (11) ______ | Vasopressin | Increases reabsorption of water from kidney tubule | (12) ______ | (13) ______ |
Given ahead is a portion from the human body showing some important structure in ventral (front) view.
 |
- Where is this portion located in the body?
- Name the structures numbered 1-3.
- State one main function of each of the structures named above.
- Is there any duct to carry the secretions from the structure numbered 2? If so, give its name.
Name the following:
Hormone regulating metamorphosis
Fill in the Blanks:
A hormone which influences the ossification of bones is ______.
Long answer question
Describe in brief an account of disorders of the thyroid.
Mention the difference between hypothyroidism and hyperthyroidism.
Name two types of disorders caused due to hyposecretion of thyroid gland.
List the hormones secreted by the following:
Thyroid
Cretinism is caused due to ______ of thyroxin.
