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
Learn about graphs. In this introductory video we will introduce coordinates, quadrants and the two axis: x-axis and y-axis. Click here to see more videos: https://alugha.com/FuseSchool VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders
Let’s discover some more circle theorems so that we can solve all types of geometrical puzzles. We discovered these 4 theorems in part 1: Angle at the centre is double the angle at the circumference The angle in a semi-circle is 90 degrees Angles in the same segment are equal / Angles subtended by
Click here to see more videos: https://alugha.com/FuseSchool If we don't have the vertical height of a triangle, then we can find the area of the triangle using 1/2absinC. In this video we are going to discover where this formula comes from. The formula is based on area = 1/2 base X height and a
