Endocrine and Metabolic Disorders

The basic problem is usually loss of water, treatment is usually with careful replacement of this loss. As with hyponatremia, it is important not to replace the loss too quickly. This is because the cells make compensatory changes during hyperosmolar conditions and a sudden change can be dangerous as the cells do not have time to readjust back to normal. The best way to prevent this is to keep checking the plasma sodium to ensure that it is not changing too quickly.

Huntington's disease is a genetic neurodegenerative disorder affecting the brain, specifically causing progressive breakdown of nerve cells in the basal ganglia. It leads to motor, cognitive, and psychiatric symptoms. The disease does not originate in the liver, pancreas, or prostate gland.

The endocrine system regulates sexual behavior through hormones like testosterone, estrogen, and progesterone, which control reproductive functions, secondary sexual characteristics, and behavior patterns.

Whitaker syndrome is another name of autoimmune polyendocrine syndrome type 1. Its nine symptoms include photophobia, decreased skin pigmentations, visual difficulties, dysplastic fingernails, cataracts, corneal clouding, alopecia, vitiligo and chronic infections. 

Iodine is essential for the synthesis of thyroid hormones (T3 and T4). Iodized salt helps prevent iodine deficiency disorders including goiter (enlarged thyroid gland), hypothyroidism, and cretinism in infants. It does not directly improve taste, digestion, or aging.

Iodine is essential for the synthesis of thyroid hormones. Its deficiency leads to inadequate thyroid hormone production, causing the thyroid gland to enlarge (goitre) as it tries to compensate.

Insulin regulates blood glucose by promoting cellular glucose uptake and storage. Iodine is for thyroid function, hemoglobin carries oxygen, and glycogen is stored glucose (not a regulator). Insulin lowers blood sugar, while glucagon raises it - together they maintain glucose homeostasis.

As per immunity theory, disappearance of thymus gland results in ageing.

Diabetes is caused by problems with insulin - either deficiency (Type 1 diabetes) or the body's cells becoming resistant to insulin (Type 2). Insulin is a hormone that regulates blood sugar levels. Iodine deficiency causes thyroid problems, not diabetes.

Addison's disease occurs when the adrenal cortex is destroyed or dysfunctional, leading to deficient secretion of glucocorticoids and mineralocorticoids. This causes fatigue, low blood pressure, and electrolyte imbalances. Option A correctly identifies the adrenal hyposecretion as the root cause.

Simmond's disease (panhypopituitarism) results from pituitary destruction, causing deficiency of all pituitary hormones. This leads to myxoedema - thickened, dry skin from thyroid hormone deficiency, among other symptoms. Option D correctly identifies this association.

Parathormone (PTH) from the parathyroid glands increases blood calcium by stimulating bone resorption, kidney calcium reabsorption, and vitamin D activation. This directly opposes calcitonin. Option B correctly identifies PTH as the calcium-raising hormone.

Diabetes mellitus results from insufficient insulin production or action. The pancreas contains beta cells that secrete insulin; when these fail, blood glucose regulation is impaired. Options A, B, and C are not primarily responsible. Option D correctly identifies the pancreas.

Insulin has multiple metabolic effects: it lowers blood glucose by promoting glycogenesis (glucose storage as glycogen) in liver and muscle; inhibits gluconeogenesis in the liver; promotes cellular uptake of amino acids; and prevents breakdown of fat and protein in adipose tissue and muscles. Since options A, B, and C are all valid insulin actions, 'all of the above' is correct.

Cushing's syndrome results from excessive cortisol production (hypercortisolism) from the adrenal cortex. This can be due to adrenal tumors, pituitary ACTH-secreting tumors, or exogenous corticosteroid administration. Symptoms include weight gain, moon face, buffalo hump, and hyperglycemia. Decreased cortisol would cause Addison's disease, not Cushing's.