ANATOMY

Detailed explanation-1: -Instead, a non-steroid hormone binds to a receptor on th e cell membr ane (see Figure below). The binding of the hormone triggers an enzyme inside the cell membrane. The enzyme activates another molecule, called the second messenger, which influences processes inside the cell.

Detailed explanation-2: -1. A nonsteroid hormone binds to receptors on the cell membrane. 2. The binding of the hormone activates enzymes on the inner surface of the cell membrane.

Detailed explanation-3: -Non-steroid hormones are made of amino acids. They are not fat soluble, so they cannot diffuse across the plasma membrane of target cells. Instead, a non-steroid hormone binds to a receptor on the cell membrane. The binding of the hormone triggers an enzyme inside the cell membrane.

Detailed explanation-4: -Most water-soluble hormones such as glycoproteins and peptides combine with a receptor present on the plasma membrane because they are not lipid soluble and cannot move through the phospholipid cell membrane. As these hormone binds to their receptor, a cascade of reactions is triggered within the cytoplasm of the cell.

Detailed explanation-5: -Receptors for steroid and thyroid hormones are located inside target cells, in the cytoplasm or nucleus, and function as ligand-dependent transcription factors. That is to say, the hormone-receptor complex binds to promoter regions of responsive genes and stimulate or sometimes inhibit transcription from those genes.