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  2. Steroid - Wikipedia

    en.wikipedia.org/wiki/Steroid

    A steroid is an organic compound with four fused rings (designated A, B, C, and D) arranged in a specific molecular configuration. Steroids have two principal biological functions: as important components of cell membranes that alter membrane fluidity; and as signaling molecules.

  3. Steroid hormone - Wikipedia

    en.wikipedia.org/wiki/Steroid_hormone

    The role of endocytosis in steroid hormone transport is not well understood and is under further investigation. In order for steroid hormones to cross the lipid bilayer of cells, they must overcome energetic barriers that would prevent their entering or exiting the membrane. Gibbs free energy is an important concept here. These hormones, which ...

  4. Estradiol - Wikipedia

    en.wikipedia.org/wiki/Estradiol

    The metabolic clearance rate of a steroid is defined as the volume of blood that has been completely cleared of the hormone per unit time. The production rate of a steroid hormone refers to entry into the blood of the compound from all possible sources, including secretion from glands and conversion of prohormones into the steroid of interest ...

  5. Cortisol - Wikipedia

    en.wikipedia.org/wiki/Cortisol

    Cortisol is a steroid hormone in the glucocorticoid class of hormones and a stress hormone. When used as medication, it is known as hydrocortisone. It is produced in many animals, mainly by the zona fasciculata of the adrenal cortex in an adrenal gland. [1] In other tissues, it is produced in lower quantities. [2]

  6. Steroid hormone receptor - Wikipedia

    en.wikipedia.org/wiki/Steroid_hormone_receptor

    A steroid hormone receptor is a protein molecule located either within the cell cytoplasm or nucleus that specifically binds to steroid hormones, such as estrogen, progesterone, and testosterone, leading to the activation or suppression of gene expression and subsequent cellular responses. This interaction is crucial for mediating the ...

  7. Hormone - Wikipedia

    en.wikipedia.org/wiki/Hormone

    A hormone (from the Greek participle ὁρμῶν, "setting in motion") is a class of signaling molecules in multicellular organisms that are sent to distant organs or tissues by complex biological processes to regulate physiology and behavior. [1] Hormones are required for the correct development of animals, plants and fungi. Due to the broad ...

  8. Glucocorticoid - Wikipedia

    en.wikipedia.org/wiki/Glucocorticoid

    It is essential for life, and it regulates or supports a variety of important cardiovascular, metabolic, immunologic, and homeostatic functions. Increases in glucocorticoid concentrations are an integral part of stress response and are the most commonly used biomarkers to measure stress. [ 3 ]

  9. Adrenocortical hormone - Wikipedia

    en.wikipedia.org/wiki/Adrenocortical_hormone

    In humans and other animals, the adrenocortical hormones are hormones produced by the adrenal cortex, the outer region of the adrenal gland.These polycyclic steroid hormones have a variety of roles that are crucial for the body's response to stress (for example, the fight-or-flight response), and they also regulate other functions in the body.