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gland that produces a secretion
secretions from gland must go through duct, duct carries secretions to a body surface or organ
islets of Langerhans
cells in pancreas which secrete the hormone insulin directly into the blood stream
occurs when there is a drop in the level of a hormone, drop triggers chain reaction of responses to increase the amount of hormone in the blood
level drops, hypothalamus gets msg, sends releasing hormone to anterior pituatary gland, releases hormone which stimulates gland, level rises
tiny structure about 10mm and 0.5g, located at base of brain in sella turcica. major influence of activities of body
anterior pituitary lobe pt 1
secretes: Growth hormone (GH) or (somatotrophin)- responsible for growth and development, helps fats to be used for energy, saving glucose & helping maintain blood sugar levels.
Prolactin hormone (PRL)- develops breast tissue and stimulates the production of milk after child birth. unknown effect in males
Thyroid-stimulating hormone (TSH) stimulates the growth and secretion of the thyroid gland
anterior pituitary lobe pt 2
Adrenocorticotropic hormone (ACTH)- stimulates the growth and secretion of the adrenal cortext
Follicle-stimulating hormone (FSH)- stimulates the growth of the graafian follice and the production of estrogen in females, and stimulates the production of sperm in males
Luteinizing hormone (LH) stimulates ovulation and the formation of the corpus luteum, which produces progesterone in females
anterior pituitary lobe pt 3
Interstitial cell-stimulating hormone (ICSH)- necessary for the production of testosterone by the interstitial cells of the testes in men
melanocyte-stimulating hormone (MSH)- is responsible for increasing skin pigmentation
posterior pituitary lobe
stores hormones produced by hypothalamus
1. Vasopressin- converts to antidiuretic hormone or ADH in the bloodstream.
2. Oxytocin- released during childbirth, causing strong contractions of the the uterus. It also causes contractions when a mother is breastfeeding. Synthetic form called- pitocin
butterfly shaped mass of tissue located in anterior part of neck. secretes 3 hormones, thyroxine, triiodothyronine, and calcitonin
5 to 10 times more active than thyoxine but activity is less prolonged. Produced in follicle cells of thyroid gland.
controls rate of metabolism, heat production, and oxidation of cells, with possible exception of brain and spleen. It can speed up or slow down the activities of the body as needed. Helps change glycogen into glucose
functions of both- stimulates protein synthesis and helps tissue growth, stimulates the breakdown of liver glycogen.
controls calcium ion concentration in the body by maintaining a proper calcium level in the bloodstream, lowers calcium level when it is too high.