Physiology 1021 Lecture Notes - Endocrine Gland, Releasing And Inhibiting Hormones, Codocyte

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The endocrine system: y consists of a series of glands that secrete different chemicals into the blood y these hormones then travel throughout the body to their large target site to initiate their effect y. Depending on chemical makeup of the hormone - it will have a very specific way in which it is carried in the blood and acts on the target cell: Hydrophilic - therefore they can circulate freely in the blood. Hydrophobic - therefore they require a protein carrier to help them circulate in the blood. Hydrophilic - therefore they cannot diffuse through the cell membrane. Hydrophobic - therefore they can diffuse easily through the cell membrane. Receptor - must be located on the cell. Receptor - located inside the target cell membrane of the target cell since it cannot diffuse into the cell. **whether the hormone is hydrophilic or hydrophobic determines how it is carried and acts on the target cell**

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