What is the key difference between primary and secondary endocrine disorders?
Primary disorders affect hormone receptors, while secondary disorders affect hormone production
Primary disorders originate in the target organ, while secondary disorders originate in the pituitary gland or hypothalamus
Primary disorders involve the hypothalamus, while secondary disorders involve the target organ
Primary disorders are caused by external factors, while secondary disorders are caused by genetic mutations
The Correct Answer is B
A. Primary disorders affect hormone receptors, while secondary disorders affect hormone production: While receptor sensitivity may play a role in some conditions, the main distinction between primary and secondary endocrine disorders is based on the location of dysfunction, not receptor or hormone function alone.
B. Primary disorders originate in the target organ, while secondary disorders originate in the pituitary gland or hypothalamus: In primary disorders, the problem lies in the endocrine gland itself (e.g., the thyroid gland in primary hypothyroidism), while secondary disorders result from dysfunction in regulatory centers like the pituitary or hypothalamus.
C. Primary disorders involve the hypothalamus, while secondary disorders involve the target organ: This reverses the correct relationship. Secondary disorders typically involve the hypothalamus or pituitary, not primary disorders.
D. Primary disorders are caused by external factors, while secondary disorders are caused by genetic mutations: While both external and genetic factors can contribute to endocrine disorders, this distinction does not define the difference between primary and secondary types. The classification is based on the anatomical source of dysfunction.
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Related Questions
Correct Answer is C
Explanation
A. Androgens (sex hormones): These are produced in the zona reticularis of the adrenal cortex. They contribute to the development of secondary sex characteristics and have a minor role compared to gonadal hormones.
B. Glucocorticoids (cortisol): Cortisol is synthesized in the zona fasciculata of the adrenal cortex. It regulates metabolism, immune responses, and the stress response, making it a key adrenal cortical hormone.
C. Epinephrine: This hormone is produced by the adrenal medulla, not the cortex. It plays a major role in the fight-or-flight response, increasing heart rate and blood glucose levels during stress.
D. Mineralocorticoids (aldosterone): Aldosterone is produced in the zona glomerulosa of the adrenal cortex. It is essential for sodium retention, potassium excretion, and blood pressure regulation.
Correct Answer is A
Explanation
A. The Somogyi effect results from an excessive insulin dose causing hypoglycemia overnight, triggering a rebound hyperglycemia via release of glucagon, cortisol, and growth hormone. In contrast, the dawn phenomenon is a natural early morning rise in blood glucose due to circadian increases in cortisol and growth hormone without preceding hypoglycemia.
B. The Somogyi effect happens only in type 2 diabetes, while the dawn phenomenon happens only in type 1 diabetes: Both effects can occur in either type 1 or type 2 diabetes depending on insulin therapy and individual physiology.
C. Both the Somogyi effect and the dawn phenomenon occur due to nighttime hyperglycemia: The Somogyi effect starts with nighttime hypoglycemia, not hyperglycemia, while the dawn phenomenon involves a gradual early morning rise in glucose levels.
D. The Somogyi effect is caused by insufficient insulin at night, while the dawn phenomenon is caused by excessive nighttime insulin: The Somogyi effect is caused by excessive insulin leading to hypoglycemia, not insufficient insulin. The dawn phenomenon is unrelated to nighttime insulin dosing and is caused by hormonal changes.
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