Terms in this set (10)
The cells in your pancreas produce a protein called insulin. The pancreas cells release insulin into your bloodstream. The job of the insulin protein is to help regulate blood sugar levels. Describe how the pancreas cells are able to produce and release this protein. Start with the cell part that makes proteins in the cell.
Ribosomes in the cell make the insulin protein. Insulin is then transported through the endoplasmic reticulum. Insulin leaves the ER inside a vesicle, and it travels to the Golgi apparatus. The Golgi apparatus finishes and prepares the insulin protein by making any necessary modifications to the protein (such as helping it to finish folding or attaching any carbohydrates that help it perform its function). Then, the Golgi apparatus packages the protein inside another vesicle and sends it to the cell membrane. The insulin proteins are released from the cell into the bloodstream through the process of exocytosis. (See diagram on next page...)
What term describes the property of a cell membrane that allows only certain particles to pass through it? Since the cell membrane only allows certain types of ions and molecules through, how would this affect the ability of different types of molecules to reach equilibrium between the cell and the fluid around it?
Salt water has a greater concentration of dissolved particles than your swollen tissues. As a result, water will move from the swollen tissue into the salt water solution. Another way to think about it is that the swollen tissue has a higher concentration of water, so water moves from the tissue into the salt water. Gargling with salt water will make your throat cells shrink, which will reduce the swelling and help your pain.
Both require the use of a membrane protein. However, active transport uses energy to move against the concentration gradient (from low→ high concentration). Facilitated diffusion does not use energy and therefore only allows substances to move down their concentration gradient (from high→ low concentration).