CBSE Class 10 Science 2020 · Paper 31/3/1 · Question 4
Questions numbers 4(a) to 4(d) are based on table given below. Study the table in which the levels of Thyroid Stimulating Hormone (TSH) in women are given and answer the questions that follow on the basis of understanding of the following paragraph and the related studied concepts.
Women are at greater risk for developing abnormal TSH levels during menstruation, while giving birth and after going through menopause. Around 5% of women in the United States have some kind of thyroid problem compared to 3% of men. Despite claims that high TSH increases your risk for heart disease, a 2013 study found no link between high TSH and heart diseases. But a 2017 study showed that older women are especially at risk for developing thyroid cancer if they have high TSH levels along with thyroid nodules.
| Age Range | Normal (mU/L) | Low (mU/L) |
|---|---|---|
| 18 – 29 years | 0.4 – 2.34 mU/L | < 0.4 mU/L |
| 30 – 49 years | 0.4 – 4.0 mU/L | < 0.4 mU/L |
| 50 – 79 years | 0.46 – 4.68 mU/L | < 0.46 mU/L |
- (a)A 35 year old woman has TSH level 6.03 mU/L. What change should she bring in her diet to control this level ?[1]
- (b)When do women face a greater risk of abnormal TSH level ?[1]
- (c)State the consequence of low TSH level.[1]
- (d)Name the mineral that is responsible for synthesis of hormone secreted by thyroid gland.[1]
Answer
She should include iodine (iodised salt) in her diet; the risk is greater in menstruation, childbirth and menopause; low TSH means an overactive thyroid.
(a) Her TSH, mU/L, is above the normal range for her age group ( to mU/L for 30 to 49 years), which shows that her thyroid is making too little thyroxine; she should monitor her iodine intake and include enough iodine in her diet, for example by using iodised salt.
(b) Any two: during menstruation, while giving birth (pregnancy) and after going through menopause.
(c) A low TSH level is a sign that the thyroid gland is not working normally: usually the gland is overactive and releases too much thyroxine, and metabolism speeds up. Such a gland is often enlarged, which shows as a swelling of the neck region (goitre).
(d) Iodine.
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