A patient presents with excessive thirst, frequent urination, and fatigue. Laboratory results reveal low levels of antidiuretic hormone. Which endocrine gland is most likely malfunctioning in this scenario?
Posterior pituitary gland
Antidiuretic hormone (ADH, vasopressin) is made in the hypothalamus and stored and released by the posterior pituitary.
Low ADH means the kidneys cannot reabsorb water, causing large volumes of dilute urine, excessive thirst and fatigue — central diabetes insipidus.
The anterior pituitary releases GH, TSH, ACTH, FSH, LH and prolactin; the adrenal cortex makes cortisol and aldosterone; the pineal gland makes melatonin.
Hence, Posterior pituitary gland.
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Important Questions from Physiology
If a person touches a hot surface and quickly pulls their hand away, which type of nerves are primarily responsible for sending the signal to move the hand?
What is the primary function of the baroreceptors located in the carotid sinus and aortic arch?
During the menstrual cycle, what typically occurs when estrogen and progesterone levels drop at the end of the cycle?
Which of the following organs play(s) the primary role in maintaining fluid and electrolyte balance in the human body?
What is the primary function of alveoli in the lungs?
