The lock-and-key method is the process by which the endocrine system brings about specific responses within target organ tissue. The nurse best explains this process by stating:
1. "The process relies on the target organ to react to the appropriate hormone.".
2. "Each hormone is keyed to facilitate a specific response.".
3. "Hormones are transported to the target organs via the circulatory system.".
4. "The specific process is either turned on or turned off by the hormone.".
"The process relies on the target organ to react to the appropriate hormone.".
Rationale: The receptors within the endocrine system are able to distinguish a specific hormone from all other chemicals in circulation and bind to it in a lock-and-key type of manner. This binding process then triggers the target tissues or organs to produce the desired response. While each hormone facilitates a specific response, it cannot do so unless it is recognized by the target organ. Hormones are transported via the circulatory system to the target organs, but this does not adequately explain the lock-and-key process. A specific hormone is required to bring about the response that may be either to cause or stop a response by the target organ, but this does not adequately explain the lock-and-key process.
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