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 B
Explanation
A. In a hypertonic solution, water moves out of the cell into the surrounding fluid, causing the cell to shrink. Therefore, the volume of the cell does not increase.
B. A hypertonic solution has a higher concentration of solutes than the inside of the red blood cell. As a result, water moves out of the cell, causing it to shrink or decrease in volume.
C. The permeability of the cell membrane is not directly affected by the tonicity of the solution. The change in cell volume is due to the movement of water, not a change in membrane permeability.
D. The permeability of the cell membrane is not typically affected by a hypertonic solution, but rather the osmotic pressure that drives water movement across the membrane. The main effect is on the cell's volume, not its membrane permeability.
Correct Answer is B
Explanation
A. The trochlear nerve (IV) controls the superior oblique muscle of the eye and is not responsible for sensation or pain in the face.
B. The trigeminal nerve (V) is responsible for sensation in the face, including pain, tingling, and touch. It also controls the muscles of mastication. A lesion or irritation of this nerve can lead to symptoms like pain and tingling in the face.
C. The glossopharyngeal nerve (IX) primarily controls the sensation in the throat and the taste sensation on the back of the tongue. It is not responsible for facial pain or tingling.
D. The abducens nerve (VI) controls the lateral rectus muscle of the eye, responsible for eye movement, but does not contribute to facial sensation.
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