Hormones are chemical messengers secreted by glands and have specific target organs. In this lesson, you will learn about hormones that stimulate changes to your body during puberty. Puberty is the timeframe when secondary sexual characteristics develop – in other words, when a boy matures physically to a man, and a girl to a woman. In males, your testes secrete a hormone called testosterone, also known as the male hormone. Testosterone stimulates a wide variety of physiological changes, including increased body hair (especially on your face and in your armpits), more muscle mass, and your voice deepening. As well, testosterone also stimulates sperm cell production in your testes. In females, the hormone responsible for physical changes during puberty is oestrogen, also known as the female hormone. It is secreted by your ovaries and is responsible for some body hair growth, widening of the hips, and development of breasts. Oestrogen also plays an important role in regulating the menstrual cycle, as described in more detail in another lesson. It thickens the uterus lining in anticipation of ovulation, which is the release of a mature egg from an ovary. In addition, oestrogen stimulates the pituitary gland to secrete the luteinising hormone, which is directly responsible for ovulation. Progesterone is another hormone secreted by your ovaries, and works to maintain the uterus lining thickened by oestrogen. This continues to occur even during pregnancy, so to support the growing foetus. In conclusion, the development of secondary sexual characteristics during puberty is stimulated by testosterone in males, and oestrogen in females. Oestrogen and progesterone are important hormones in regulating the menstrual cycle in females. VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders, and to see what else we have on offer. Comment, like and share with other learners. You can both ask and answer questions, and teachers will get back to you. These videos can be used in a flipped classroom model or as a revision aid. Click here to see more videos: https://alugha.com/FuseSchool Twitter: https://twitter.com/fuseSchool Access a deeper Learning Experience in the FuseSchool platform and app: www.fuseschool.org Friend us: http://www.facebook.com/fuseschool This Open Educational Resource is free of charge, under a Creative Commons License: Attribution-NonCommercial CC BY-NC ( View License Deed: http://creativecommons.org/licenses/by-nc/4.0/ ). You are allowed to download the video for nonprofit, educational use. If you would like to modify the video, please contact us: info@fuseschool.org
Interest is the amount charged by a lender to a borrower. It means that if you borrow some money from a bank, you have to pay back more than the money you borrowed. Equally, if you have a savings account and deposit some money, the bank will pay you interest as a sort of thank you for saving with th
In this video we are going to look at a few different ways in which plant hormones can be used. Plant growth hormones (auxins) can be used as selective weedkillers. The selective weedkillers contain growth hormones, that cause the weeds to grow really quickly. This means the weed is absorbing nutr
Algebraic fractions are simply fractions with algebraic expressions either on the top, bottom or both. We treat them in the same way as we would numerical fractions. In this video we look at how to simplify algebraic fractions, and how to add and subtract them. VISIT us at www.fuseschool.org, wh
