Nontropic hormones: act directly on target-tissue cells B-FLAT : B asophils secrete F SH, L H, A CTH, and T SH. All pituitary glycoprotein hormones (e.g., FSH, LH, TSH) have a common alpha subunit. Since GH and Prolactic are not tropic hormones, they don’t create a feedback loop, like all the others do. Tropic hormones: act on endocrine glands to mediate their effects. When the secretion of hormone is controlled by some factors or other hormones is called as feedback control. Tropic hormones from the anterior pituitary include Thyroid-stimulating hormone, Adrenocorticotropic hormone, Growth hormones.
Why? Because mammary glands are not endocrine glands, they secrete milk out the breast. Most tropic hormones are produced and secreted by the anterior pituitary. (The model of ALL tropic hormones is a NEGATIVE FEEDBACK LOOP.)ġ & 2) The two that are not tropic are Growth Hormone (affects bone/muscles) and Prolactin (affects mammary glands). Tropic means they affect other endocrine glands. Four of them are considered tropic hormones and two are not tropic.
ACTH targets the cortex of the adrenal glands to release cortisol. Thyroid-stimulating hormone (TSH or thyrotropin) – stimulates the thyroid gland increasing the size and number of cells. Adrenocorticotropic hormones (ACTH) are tropic hormones usually released by the anterior pituitary in response to stress.Trophic hormones from the anterior pituitary include: This should not be confused with tropic, as in the similar-sounding tropic hormone – the words and concepts are both unrelated.Īn example of this is thyroid-stimulating hormone stimulating the thyroid excess thyroid-stimulating hormone can create a goitre.
The term trophic is from Ancient Greekτροφικός ( trophikós) meaning "pertaining to food or nourishment", here used to mean "growth" this is the same origin as atrophy. Trophic hormones can be found in body systems including the endocrine, gastrointestinal, urinary, and nervous systems. These hormones affect growth, function, or nutrition of other endocrine cells. Trophic hormones are hormones of the anterior lobe of the pituitary.