hormones
Steroid hormones stimulate the protein synthesis, because steroid hormones pass easily through the plasma membrane, their receptors are inside the target cells. After being released from a carrier protein in the blood stream, the steroid hormone enters the target cell by diffusion and binds
Hormones modify the biochemical activity of a target cell or tissue. Two basic mechanisms are involved. ---------------------------- ---------------------------- Fixed – Membrane – Receptor Mechanism The fixed – membrane – receptor mechanism, applies to hormones that are proteins or amines. Because they are water –
In terms of their chemical structure, hormones can be grouped into two general classes: i) lipid, or steroid, hormones ii) hormones derived from amino acids. Steroid hormones, which include the sex hormones, are lipid molecules the body makes from cholesterol. Most invertebrate neurosecretory cells
An animal hormone (Grhormaein, to set in motion or to spur on) is a chemical signal that is secreted into body fluids, most often into the blood, by specialized cells called endocrine’ cells or by specialized nerve cells called neurosecretory cells. Neurosurgery cells are