https://padlet.com/kseymour23/rs1l0anz4k7d Life science pages 65-69 en-us 2017-11-03 15:25:15 UTC 2025-11-25 22:17:11 UTC hello@padlet.com mjenny23 https://padlet.com/kseymour23/rs1l0anz4k7d/wish/203665026 The cell membrane is extremely important and plays a crucial role in every cell. A cell membrane consists of two layers of lipid molecules packed closely together to create a wall.  
 Did you know that lipids are a group of organic compounds found in all living things? Sometimes in layers of lipid molecules you can see proteins, some have chains with carbohydrates attached to them others do not. Other carbohydrate chains sit on the surface of the membrane. All these materials each have an important role in helping materials move freely through the cell membrane. Other materials move less freely or not at all. The cell membrane is selectively permeable which means that some substances in the cell membrane can move freely while others can not. 

Morgan Jenny]]> 2017-11-05 18:38:29 UTC https://padlet.com/kseymour23/rs1l0anz4k7d/wish/203665026 alockhart23 https://padlet.com/kseymour23/rs1l0anz4k7d/wish/203850034 Active Transport is when molecules move around in cells. Because of diffusion, the molecules move in the opposite direction from their natural state. Cells have to store lotsof  energy for this to happen. Active Transport is like a highway for transporting molecules. The molecules act as a truck supplying different goods, and taking them to other places that need them. The goods are usually substances like ions, glucose, and amino acids.]]> 2017-11-06 13:20:16 UTC https://padlet.com/kseymour23/rs1l0anz4k7d/wish/203850034 akourieh23 https://padlet.com/kseymour23/rs1l0anz4k7d/wish/203965294 Defussion and osmosis

Moving materials across the cell membrane usually requires the cell to use its own energy. At times, the cell uses no energy. The movement of dissolved materials across a cell membrane without using the cells energy is called passive transport.

Water passes easily into and out of a cell across the cell membrane. Osmosis is the diffusion of water molecules across a selectively permeable membrane. Osmosis can have important effects on cells and entire organisms. Osmosis can cause water to move out of the cells more quickly than it moves in.

Oxygen and carbon dioxide diffuse freely across a cell membrane. Molecules such as sugar do not. It is harder for some substances to cross into the membranes lipid molecules.]]> 2017-11-06 16:17:41 UTC https://padlet.com/kseymour23/rs1l0anz4k7d/wish/203965294 kseymour23 https://padlet.com/kseymour23/rs1l0anz4k7d/wish/204903720 Moving  large particles such as food is very important because if the material that is trying to pass through the cell membrane is to large it will not pass through . Endocytosis moves the particles into different sizes so it may pass through the cell membrane .]]> 2017-11-08 16:28:03 UTC https://padlet.com/kseymour23/rs1l0anz4k7d/wish/204903720