Epinephrine and norepinephrine. These hormones, secreted by the adrenal medulla, are responsible for the “fight or flight” response. Which of these hormones are responsible for the fight or…

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exert their action by passing through the plasma membrane and bind to intracellular receptors. The sex hormones estrogen, progesterone, and testosterone are steroids. The adrenal cortex hormones aldosterone…

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This may occur years before other signs occur. Other signs can occur a bit differently in each child and can vary by age. Signs in younger children (juvenile…

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How common is thyrotoxicosis? Thyroid disease tends to be commoner in women than men (up to 10 times more). Thyrotoxicosis can occur at any age and there is…

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Thyroid disease can cause persistent xerostomia (dry mouth). In fact, while there are many causes of dry mouth, one study found that about half of people who are…

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Papillary thyroid cancer, which is the most common type of thyroid cancer, makes up about 80% of all cases of thyroid cancer. It is one of the fastest…

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Definition. These chemicals (mostly peptides) are produced by specific cells (neurosecretory cells) situated mainly in the hypothalamus and transported to the anterior pituitary gland. There they stimulate or…

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The hypothalamus produces a polypeptide hormone known as antidiuretic hormone (ADH), which is transported to and released from the posterior pituitary gland. The principal action of ADH is…

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Low testosterone does not cause infertility. Sperm production is actually stimulated by hormones other than testosterone. Testosterone is required for sperm production, but the level in the testes…

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For this test, you collect a sample at home and mail it back to a lab. Some testosterone test kits require saliva sample collection, while some need a…

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