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प्रश्न
Differentiate: Nervous control and Hormonal control.
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उत्तर
| Nervous Control | Hormonal Control |
| The information is sent in the form of electric signals. | The information is sent in the form of chemical signals. |
| The signals travel through nerve fibres to specific target cells like muscle fibres and glands. | The signals travel through blood stream to cells in different organs. |
| Nervous system causes muscles to contract or relax, glands to secrete more or less. But it cannot bring about growth. | Endocrine system brings about changes in metabolic activities of all body tissues. It affects growth. |
| Action is immediate (within few milliseconds.) | Action is slow (can take hours or days to produce response). |
| Effect lasts for a sliort time. | Effect is more lasting and permanent. |
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Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the term in Column ‘II’ with a suitable idea given in Column ‘I’.
| Column A | Column B |
| (i) Pituitary | (a) produces male sex characteristics |
| (ii) Ovaries | (b) decreases blood sugar level |
| (iii) Thyroid | (c) increases heart and breathing rate raises blood pressure |
| (iv) Thymus | (d) produces female sex characteristics |
| (v) Adrenals | (e) is known as emergency hormone |
| (vi) Hypothalamus | (f) regulates the level of calcium and phosphorus |
| (vii) Pancreas | (g) increases the rate of metabolism |
| (viii) Testes | (h) maintains the level of calcium |
| (ix) Parathyroid | regulates the amount of water excreted in the urine. |
| (x) Cretinism | (j) simulates skeletal growth |
| (xi) Diabetes mellitus | (k) regulates the activities of other glands |
| (xii) Insulin shock | (l) stimulates the development of male and female sex organs |
| (xiii) Gigantism | (m) Shortage of glucose in the blood. |
| (xiv) Enlargement of breasts in adult males | (n) Over-secretion of growth hormone |
| (xv) Exophthalmic goiter | (o) Excess of glucose in the blood |
| (xvi) Acromegaly | (p) Over-secretion of thyroxin |
| (xvii) Addison’s disease | (q) Dwarfism and mental retardation |
| (xviii)Cretinism | (r) Over-secretion of cortical hormones |
| (xix) Dwarfism | (s) Under-secretion of the adrenal cortex |
| (xx) Adrenalin | (t) Under-secretion of thyroxin in children |
| (xxi) Vasopressin | (u) Over-secretion of growth hormones in adults |
Which of the following organs in mammals does not consist of a central meduallary’ region surrounded by a cortical region?
Acromegaly is caused by ______.
Choose the odd one out from series and write the category of the remaining terms:
