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You will learn about "Animal Cell" in this video. The animal cell is surrounded by a flexible cell membrane that encloses all the contents of the cell. It is semi- permeable, i.e. it allows only specific materials to move in and out of the cell.
The different parts of the cell are called organelles. The animal cell has a jelly like substance called cytoplasm that provides a surface for all organelles.
The nucleus is the control centre of the cell. It decides and controls most of the functions going on in the cell.
The mitochondria are the sites for cellular respiration in the cell. They are known as the powerhouses of the cell as they release energy rich compounds called ATP, which are needed for the functioning, growth and maintenance of the body.
The endoplasmic reticulum is a large network of membrane bounds sheets and tubes. It helps to transport and exchange materials between the various regions of the cytoplasm. There are 2 types of the endoplasmic reticulum, the rough endoplasmic reticulum and the smooth endoplasmic reticulum.
It is called the rough endoplasmic reticulum due to the presence of ribosomes on its surface that help in the building and synthesis of proteins.
While, it is called the smooth endoplasmic reticulum due to the absence of ribosomes. They are involved in synthesis of lipids which are essential components of the cell membranes
Ribosomes then carry these proteins to the golgi apparatus that process and package these proteins. The layers of golgi apparatus are called golgi bodies. They are involved in the formation of lysosomes. The lysosomes are called the suicide bags of the cell. They help in cell digestion. They break down the cell wastes and convert it into new cell building material in the cytoplasm.
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Introverts could be the key to making a difference to our lives. If you think you lack the confidence to get out into the world and make an impact, watch this video.
Sarah talks about how the qualities of introverts create more effective activism, and gives some examples of the best way introverts can contribute.
Sarah Corbett grew up in an activist family and has worked as a professional campaigner for 6 years most recently with Oxfam. She started doing craftivism (craft + activism) in 2008 as a reaction to traditional aggressive or quick forms of activism. Due to demand Sarah set up the global Craftivist Collective in 2009 which now has thousands of supporters across the world taking part in her craftivism projects. This hobby has turned her into one of the leading spokespeople in the craftivism movement and regularly gives talks & lectures around the world. Sarah works with art institutions such as V&A, Southbank & National Portrait Gallery as well as charities such as Save the Children & Unicef and has also collaborated with cult jewellers Tatty Devine & Secret Cinema amongst others. Sarah also sells products, delivers workshops & exhibits her own craftivism work around the world. Her book “A Little Book
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Hank tells us about new research into the question of how animals navigate from place to place - while the problem is still unresolved, we do have some hypotheses, and they all involve something called "magnetoreception."
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