Tuesday, March 17, 2020
The Role of Melatonin in Determining the Sleep
The Role of Melatonin in Determining the Sleep Introduction The pineal gland that is positioned in the brain produces the hormone melatonin (Blask, 2009). Melatonin plays a significant role in the circadian control of sleep as well as in restraining the development of malignant cells. In addition, melatonin improves the performance of the immune system (Blask, 2009). This paper is a patient education material on the role of melatonin in determining the sleep-wake patterns.Advertising We will write a custom essay sample on The Role of Melatonin in Determining the Sleep-Wake Cycle specifically for you for only $16.05 $11/page Learn More Melatonin and Sleep The human body undergoes regular cycles every twenty-four hours. These cycles, which entail sleep, secretion of certain hormones and regulation of body temperature, are referred to as circadian cycles. The suprachiasmatic nucleus in the hypothalamus contains a rhythm-creating system that regulates the secretion of melatonin (Jarvis, Russell Gorman, 2004 ). Melatonin, which works as a night indicator, also controls this system. As darkness approaches, the pineal gland starts to secrete melatonin. The quantity of melatonin secreted increases as the darkness intensifies. Melatonin then sends a signal to the brain region that is responsible for the control of the sleep-wake cycle. Consequently, the brain responds by causing sleep. In the morning, the quantity of melatonin in the blood and in the brain reduces significantly thereby causing one to be awake. Contact of the eyes with light also diminishes the concentration of the hormone in the blood. Regulation of Melatonin Light and darkness are the key regulators of melatonin levels. Factors such as jet-lag (traveling to different time zones), working late at night and irregular sleep hours affect the secretion of melatonin and subsequently alter the sleep-wake cycle. Although melatonin is secreted naturally, synthetic melatonin is readily and can be used to improve sleep outcomes in pe ople with sleep disorders (Franco, 2008). Conclusion The sleep-wake cycle is important as it allows the body to have adequate rest. Therefore, we ought to ensure that we have sufficient hours of sleep to ensure the overall well-being of our bodies. References Blask, D. E. (2009). Melatonin, sleep disturbance and cancer risk. Sleep Medicine Reviews, 13(4), 257-264.Advertising Looking for essay on health medicine? Let's see if we can help you! Get your first paper with 15% OFF Learn More Franco, R. (2008). Melatonin. Web. Jarvis, M., Russell, J., Gorman, P. (2004). Angles of psychology (2nd ed.). United Kingdom: Nelson Thornes.
Sunday, March 1, 2020
French Indefinite Relative Pronouns
French Indefinite Relative Pronouns Just as in English, a relative pronoun links a relative clause to a main clause. This is true for both relative pronouns and indefinite relative pronouns. The difference is that regular relative pronouns have a specific antecedent, but indefinite relative pronouns do not. If you dont understand relative pronouns, I highly recommend that you go back to that lesson before studying this one. There are four* French indefinite relative pronouns; each form is used only in a particular structure, as summarized here. Note that theres no one-to-one equivalent for these words - depending on context, the English translation may be what or which: Subject ce qui  what Direct object ce que/qu  what Object of de** ce dont  which, what Object of a preposition** quoi  which, what *Theres a fifth indefinite relative pronoun, quiconque, but it is rare and complicated, so I address it in a separate lesson. **Remember that French verbs often require different prepositions than English verbs, so you really need to be careful with ce dont and quoi - its not always obvious which one is correct. When there is no preposition, of course, you use ce que. Note that when the pronoun tout is used with indefinite relative pronouns, it changes the meaning to everything or all. Ce qui serves as the subject of a relative clause and takes the il form of the verb.    Ce qui mintà ©resse, cest la langue.What interests me is language.    Sais-tu ce qui lui plaà ®t?Do you know what pleases him?    Cest ce qui me dà ©range.Thats what bothers me.    Tout ce qui brille nest pas or.All that glitters is not gold. Ce que is used as the indefinite direct object in a relative clause.    Ce que je veux, cest à ªtre trilingue.What I want is to be trilingual.    Sais-tu ce que Pierre a fait ?Do you know what Pierre did?    Cest ce que je dà ©teste.Thats what I hate.    Tout ce quil à ©crit est amusant.Everything he writes is funny. Ce dont is used as the object of the preposition de.    Ce dont jai besoin, cest un bon dico.What I need is a good dictionary.    Sais-tu ce dont Luc parle ?Do you know what Pierre is talking about?    Cest ce dont je me souviens.Thats what I remember.    Jai tout ce dont jai envie.I have everything I want. Quoi is the object of any preposition except de.    Sais-tu quoi il pense ?Do you know what hes thinking about?    Jai à ©tudià ©, aprà ¨s quoi jai lu.I studied, after which I read.    Avec quoi à ©crit-il ?What is he writing with?    Ce quoi je mattends, cest une invitation.***What Im waiting for is an invitation.    Cest ce quoi Chantal rà ªve.***Thats what Chantal dreams about. ***When quoi is at the beginning of a clause or follows cest, the word ce is placed in front of it (ce quoi).
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