Answer:
C. endocrine control, because melatonin is secreted into the blood and regulates body processes
Explanation:
As mentioned in the question, melatonin is secreted by endocrine gland which is a part of human glandular or endocrine system. Endocrine system is responsible for secreting chemical messengers into the circulatory system of the humans, from where they travel to different target sites like brain.
Melatonin is also a chemical messenger which is secreted by pineal gland and travels through the blood stream to the targeted brain parts. When it reached the brain it directs it about the sleep wake cycle by causing lowered body temperature and increased drowsiness which together work in regulating sleep/wake cycle.
The endocrine system of the brain, is responsible for the regulation of melatonin secretion levels along with the hypothalamus region which get stimulated by light.
Therefore, C is the best option.
Hope it helps!
Answer:
C. endocrine control, because melatonin is secreted into the blood and regulates body processes.
Explanation:
Melatonin is a hormone linked to the circadian cycle, ie, the way the body organizes its functions when we are awake and during sleep. The substance begins to be produced in the pineal gland as day goes on to help the body prepare for sleep. It reaches its maximum level when we are sleeping. As the sun rises and the light returns, the gland reduces the production of melatonin, which signals that it is time to wake up.
This hormone is secreted directly into the blood and regulates body processes, so we can say that melatonin is controlled by the endocrine system, which is the system responsible for producing hormones that are released into the blood and travel the body to control body processes.
