Which endocrine gland secretes a hormone that influences the sleep/wake cycle?

Endocrine activity during sleep Almost all functions of humans are subject to cyclic changes and are governed by the nervous system. Most rhythms are driven by an internal biological clock located in the hypothalamic suprachiasmatic nucleus (SCN) and can be synchronized by external signals such as light-dark cycles. Homeostatic activities such as body temperature, blood…

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What is target cells in hormones?

Hormone receptors and target cell responsiveness The present article deals with some basic principles in the mechanism of hormone action. All classes of hormones elicit the majority of their physiological effects via specific receptors which are located in three separate compartments of target cells: cell membranes (peptide and glycopeptide hormones), cytoplasm (steroid hormones) and nucleus…

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