Melatonin receptors are found in the SCN and the pituitary gland of the brain, as well as in the ovaries, blood vessels, and intestinal tract. There is a high concentration of receptors in the SCN because this is where melatonin mediates the majority of its affects on circadian rhythm. The binding of melatonin to its receptors on the pituitary gland and the ovaries appears to play a role in regulating the release of reproductive hormones in females. For example, the timing, length, and frequency of menstrual cycles in women are influenced by melatonin.
The process by which the nervous system bypasses the brain to increase response time is called a A. feedback mechanism. B. contraction. C. reflex. D. hormonal response. The process by which the nervous system bypasses the brain to increase response time is called a REFLEX. Log in to see link for more information.
Sequence. In a simple reflex action: stimulus â receptor â sensory neurone â relay neurone â motor neurone â effector. An effector is any part of the body that produces the response.Here are some examples of effectors: 1  a muscle contracting.2  a gland releasing (secreting) a hormone or other chemical.eflex actions. When a receptor is stimulated, it sends a signal to the central nervous system, where the brain co-ordinates the response. But sometimes a very quick response is needed, one that does not need the involvement of the brain. This is a reflex action.