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messenger molecules that travel in the circulatory vessels and signal physiological changes in target cells
True Endocrine Organs (5)
Types of Hormones (2)
Steroids- lipid molecules derived from cholesterol
Amino Acid Based Hormones- peptides, proteins, and modified amino acids
-have specific receptors which bind to specific hormones and then react in a pre-programmed response
Path of Hormones
secreted from particular gland ----(neural/blood pathway)----> target cell ---->physiological response
hormones from certain endocrine glands secrete hormones that stimulate other endocrine glands so that they released their hormone
Hormone secretion is started/stopped based on a set blood concentration level. Once the blood concentration achieves homeostasis hormone secretion stops.
As blood concentration of hormone increases, the effector organ secretes more hormone ex:oxytocin
Divisions of the Pituitary Gland
Anterior Lobe (composed of glandular tissue)
Posterior Lobe (composed of neural tissue)
Pituitary Anterior Lobe Hormones
-Thyroid Stimulating Hormone
-Follicle Stimulating Hormone
-Melanocyte Stimulating Hormone
Growth Hormone (GH)
type of cells: somotropic
target organ: liver, muscle, bone, etc.
response: stimulated protein synthesis, somatic growth
Thyroid Stimulating Hormone (TSH)
type of cells: thyrotroph
target organ: thyroid gland
response: stimulates thyroid to release TH
Adrenocorticotropic Hormone (ACTH)
type of cells: corticotroph
target organ: adrenal cortex
response: release of adrogens
Follicle Stimulating Hormone (FSH)
type of cells: gonadotropic cells
target organ: gonads
response: stimulates estrogen/testosterone production
Antidiuretic Hormone (ADH)
response: kidney cells resorb water and return it to blood
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