Hormones are chemical messengers. In order to have an effect on a cell then it is necessary for the cell to have the correct receptor proteins. The hormone can bind to these receptor proteins and therefore will affect the cell.
Target cells respond to hormones because they have specific receptors for the hormone on their cell membrane or inside the cell. These receptors enable the hormone to bind and initiate a cellular response. Other cells that do not have the specific receptors for that hormone are unaffected because they cannot bind to the hormone or activate the necessary signaling pathways.
Only target cells respond to hormones because they have a receptor for the hormone. They are the key that fits the lock.
growth hormone
oxytocin
Hormone receptor
Serotonin is not a hormone. It is a neurotransmitter.
Only target cells respond to hormones because they have a receptor for the hormone. They are the key that fits the lock.
Target Cells
growth hormone GH
growth hormone
oxytocin
Receptor molecules are found on cell surfaces and respond to nerve and hormone signals.
ACTH means adrenocorticotrophic hormone. The target for this hormone is adrenal gland. It stimulate the gland to produce the corticosteroid hormone.
Hormone receptor
Serotonin is not a hormone. It is a neurotransmitter.
The main primary target tissue of the Parathyroid hormone is the bone, but the kidneys are a target as well.
Receptors for that hormone
prolonged exposure to high hormone concentrations desensitizes the target cells, so that they respond less vigorously to hormonal stimulation. This "down-regulation" involves loss of receptors and prevents the target cells from overreacting