BIOA02H3 Lecture Notes - Lecture 3: Thyroid, Catechol, Gangrene
43
BIOA02H3 Full Course Notes
Verified Note
43 documents
Document Summary
Melatonin produced by the pineal gland is important in promoting sleep. It requires darkness in order to be produced; even the small amount of light emitted by a phone can be sufficient to prevent melatonin production and therefore hinder sleep. Melatonin supplements can be effective in helping treat insomnia but need to be taken in a certain window before you wish to fall asleep and are most effective when it is dark. Circulating hormones are synthesized within and released from endocrine cells within an endocrine gland. The diffuse through the extracellular fluid, enter the blood and are transported to target tissues. Catecholamine hormones (adrenaline and noradrenaline) are examples of circulating hormones. Synthesized within and released from the adrenal gland. They circulate in the blood and then act on target tissues by binding to adrenergic receptors which can be subdivided into alpha ( ) and beta ( ) subtypes.
