CBSE Class 10 Science 2020 · Paper 31/5/1 · Question 4
Question numbers 4(a) – 4(d) are based on the table and related information in the passage given below.
Thyroid Stimulating Hormone (TSH) stimulates thyroid gland to produce thyroxine. Study the table given below.
It is important to monitor TSH levels during pregnancy. High TSH levels and hypothyroidism can especially affect chances of miscarriage. Therefore, proper medication in consultation with a doctor is required to regulate/control the proper functioning of the thyroid gland.
| Stage of pregnancy | Normal (mU/L) | Low (mU/L) | High (mU/L) |
|---|---|---|---|
| First trimester | 0.2 – 2.5 | < 0.2 | 2.5 – 10 |
| Second trimester | 0.3 – 3.0 | < 0.3 | 3.01 – 4.5 |
| Third trimester | 0.8 – 5.2 | < 0.8 | > 5.3 |
- (a)Give the full form of TSH.[1]
- (b)State the main function of TSH.[1]
- (c)Why do TSH levels in pregnant women need to be monitored ?[1]
- (d)A pregnant woman has TSH level of 8.95 mU/L. What care is needed for her ?[1]
Answer
TSH (Thyroid Stimulating Hormone) makes the thyroid produce thyroxine; high TSH in pregnancy risks miscarriage, so medication and monitoring under a doctor are needed.
(a) Thyroid Stimulating Hormone.
(b) TSH, released by the pituitary gland, stimulates (regulates) the thyroid gland to produce the hormone thyroxine.
(c) Because an abnormal TSH level, particularly a high TSH level with hypothyroidism, can increase the chances of miscarriage; monitoring detects it early so that it can be corrected.
(d) Her TSH level is high: mU/L is above the normal range in every trimester. She needs proper medication in consultation with a doctor to regulate the functioning of her thyroid gland, with regular monitoring of her TSH level.
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