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. Which of the following statements concerning thyroid function are correct?

T3 and T4 stimulate the secretion of TSH by the anterior pituitary correct incorrect

People who have an under-active thyroid gland have a low BMR correct incorrect

A thyrotoxic patient might have a resting heart rate of 65 bpm correct incorrect

Most of the iodide in the body is present in the thyroid gland correct incorrect

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. Thyroid hormones are essential for the early development and maturation of the central nervous system.

True correct incorrect

False correct incorrect

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. The thyroid gland avidly takes up iodine against a steep electrochemical gradient via an ATP driven iodide pump.

True correct incorrect

False correct incorrect

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. Which of the following statements regarding the thyroid gland are correct?

A person with hypothyroidism has a low plasma TSH concentration. correct incorrect

Calcitonin is secreted by the parafollicular cells of the thyroid gland. correct incorrect

An inactive thyroid gland will contain more colloid than an active one. correct incorrect

Calcitonin stimulates the activity of osteoclasts. correct incorrect

Calcitonin is a steroid hormone. correct incorrect

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. Which of the following statements regarding parathyroid hormone (PTH) are correct?

Normal plasma levels of parathyroid hormone (PTH) stimulate osteoblast activity correct incorrect

PTH decreases calcium excretion from the body correct incorrect

PTH directly increases calcium absorption by the gut. correct incorrect

PTH is secreted in response to elevated plasma calcium levels. correct incorrect

High levels of circulating PTH demineralize bone and elevate plasma calcium correct incorrect

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. Which of the following are symptoms of myxoedema?

Dry cold skin correct incorrect

Lethargy correct incorrect

Weight loss correct incorrect

Loss of hair correct incorrect

Bulging eyes correct incorrect

Puffiness of the face correct incorrect

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. A 35 year old man reports feeling irritable and stressed. He has lost 3.5 kg in weight over the past 3 months and his hands have developed a fine tremor. A blood test reveals that his thyroid stimulating hormone and thyroid hormone levels are 0.17 mU l-1 and 224 nmol l-1 respectively. Normal values are 0.5-5.7 mU l-1 and 70-140 nmol l-1. What is most likely cause of his symptoms?

Hashimoto's thyroiditis correct incorrect

Iodine deficiency correct incorrect

Grave's disease (thyrotoxicosis) correct incorrect

Myxoedema correct incorrect

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. A 40 year old woman has experienced several days of a tingling sensation in her fingers which culminated in a severe spasm of both her hand and jaw. Which of the following is the most likely explanation of her condition?

A low plasma calcium (hypocalcaemia) correct incorrect

A tumour of the parathyroid glands correct incorrect