No, according to my desire2learn Chapter 11 Endocrine SX.
A type of hormone
Hormones affect target cells because target cells have receptors that bind with certain hormones (they're specific). If a cell does not have a receptor then it is not affected by hormones. Target cells (which do have the receptor for a particular hormone) would be affected by the hormone.
The target receptor proteins of cells will cause them to affected by a specific protein. These cells are also called "target" cells. Hormones flow via the bloodstream throughout the entire body, but they only affect their specific "target" cells.
receptors
The gonads. It stimulate the hormone secretions. Also stimulate ova emission.
false
A type of hormone
Only target cells have receptors inside cytoplazm (for steroid hormones) or on cell membrane (for protein hormones) that make the hormone active.
They bond to receptor sites on their target cells to facilitate some reaction, depending on the hormone. For example, insulin is a protein hormone that bonds on receptor sites on muscle cells to allow the diffusion of glucose into the muscle cell. Without insulin, the cell membrane is impermeable to glucose, but the insulin bridge made when the hormone bonds with receptors on the muscle cell membrane allows for the glucose to pass through. This is called facilitated diffusion.
The binding of a hormone to a receptor is the first step. Target cell activation by hormone-receptor interaction depends equally on 3 factors. First the blood levels of the hormone, second ,relative numbers of receptors for that hormone on or in the target cells and the third ,strength of the binding between the hormone cell and the receptors.
Hormones are specific molecules released by endocrine glands into the bloodstream. Each hormone binds to a specific receptor protein on the surface of the target cell. The receptor protein acts like a lock and key, ensuring that only the specific hormone can bind and trigger a cellular response in the target cell.
Hormones affect target cells because target cells have receptors that bind with certain hormones (they're specific). If a cell does not have a receptor then it is not affected by hormones. Target cells (which do have the receptor for a particular hormone) would be affected by the hormone.
ACTH means adrenocorticotrophic hormone. The target for this hormone is adrenal gland. It stimulate the gland to produce the corticosteroid hormone.
Hormone receptor
When receptors bind at the surface of a membrane, second messengers are released. This is how peptide hormones and catecholamines affect target organ cells.
The main primary target tissue of the Parathyroid hormone is the bone, but the kidneys are a target as well.
Serotonin is not a hormone. It is a neurotransmitter.