Capitolo 21
Sistema endocrino
Cos'è il sistema endocrino?
The endocrine system sends hormones—chemical signals—through the bloodstream to target cells—the cells the hormones selectively affect. ...
Recettori ormonali intracellulari
Lipid-soluble hormones diffuse across the plasma and nuclear membrane of target cells to bind to their specific intracellular receptors. These receptors ...
Segnalazione di membrana
Hormones—or any molecule that binds to a receptor, known as a ligand—that are lipid-insoluble (water-soluble) are not able to diffuse across ...
Feedback Loops
In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a ...
Asse ipotalamo-ipofisario
The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. ...
Tipi di ormoni
Hormones can be classified into three main types based on their chemical structures: steroids, peptides, and amines. Their actions are mediated by the ...
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