Cushing's syndrome is a result of hypersecretion of which of the following glands?
Adrenal
Pituitary
Parathyroid
Thymus
The Correct Answer is A
A. Cushing's syndrome is most commonly caused by the hypersecretion of cortisol from the adrenal glands. It can also result from excess production of adrenocorticotropic hormone (ACTH) from the pituitary gland, but the primary issue is often adrenal hypersecretion.
B. While the pituitary gland can contribute to Cushing's syndrome by secreting too much ACTH (which stimulates the adrenal glands), it is the adrenal glands that primarily cause the symptoms of the condition.
C. The parathyroid glands are responsible for regulating calcium levels in the blood, not for the production of cortisol.
D. The thymus plays a role in immune system development, but it is not involved in Cushing's syndrome.
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Related Questions
Correct Answer is D
Explanation
A. The production of breast milk is the function of the mammary glands, not the lacrimal gland.
B. The production of saliva is the function of the salivary glands, not the lacrimal gland.
C. The secretion of cerumen (earwax) is the function of the ceruminous glands, not the lacrimal gland.
D. The lacrimal glands are responsible for the secretion of tears, which help to lubricate and protect the surface of the eyes. This is the correct answer.
Correct Answer is C
Explanation
A. The kidneys do not play a role in the chemical breakdown of protein. Their primary function is filtration and regulation of blood composition.
B. The mouth is where mechanical digestion (chewing) occurs, but chemical digestion of proteins does not begin there. Enzymes like amylase break down carbohydrates, not proteins.
C. The stomach is where protein digestion begins. The enzyme pepsin, activated by stomach acid (HCl), starts breaking down proteins into smaller peptides. This is the correct answer.
D. The small intestine continues the digestion of proteins, but the initial breakdown occurs in the stomach. The pancreas also releases digestive enzymes, including trypsin, to further digest proteins in the small intestine.
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