address this question: “Propose a possible explanation on why the light caused depolarization of the off-center ganglion cell?” we first have to describe the structure of the center -surround in the receptive fields of retinal. In the receptive field‚ there are cone photoreceptors that communicate with On and Off center bipolar cell and finally On and Off center ganglion cells that carry the action potential to the cortex. When light comes to the retina (eyes) it causes closing of channels in the
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allow cell phones to be sold without pre-market testing. The rationale‚ known as the “low power exclusion‚” distinguished cell phones from dangerous microwave ovens based on the amount of power used to push the microwaves. At that time‚ the only health effect seen from microwaves involved high power strong enough to heat human tissue. The pressure worked‚ and cell phones were exempted from any type of regulatory oversight‚ an exemption that continues today. An eager public grabbed up the cell phones
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Cell Reproduction Dr. Susan Kennedy Introduction to Biology January 28‚ 2012 Introduction Cellular reproduction is the process by which cells duplicate their contents and then divide to yield two cells with similar‚ if not duplicate contents. Life as we know it depends on the ability of cells to store‚ retrieve and translate the genetic instructions required to make and maintain a living organism. In this assignment‚ I will discuss two different types of cell reproduction
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Abstract Cellular phones have been around for a quite a long time. Cell phones have advance over time and now have many features that make them unique and specific. Now phone companies are in competition with each other to see who has the better cell phone service. Every cell phone works different and everybody use their cell phone for different a reason which is why people have a different taste in cell phones. People usually look for a cell phone that matches what they need and their style. Some
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------------------------------------------------- Cell phones Imagine being able to talk to someone that is across the world with a push of a button. Seems a little far-fetched? Well‚ there is such a device that allows you to do that. It is called the cell phone. Cell phones are devices that enable people to talk to others no matter how far away they are from each other. They can be on opposite sides of the planet and they still will be able to talk to each other. Many people nowadays use cell phones very frequently for
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Are cell phones dangerous? Cell phones are a wonderful thing. You can talk. Take pictures. Listen to music. Converse over email or text messaging‚ and browse the Internet among a handful of other things. I love to use my cell phone and actually use it more then any other phone at the office or at home. However‚ I use it with immense concern. I have concern about the use of the phone causing health issues‚ like cancer and brain tumors over time. Are these concerns warranted? I have studied technology
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SPECIALIZED CELL ANIMAL Sperm cells PLANT Xylem cells are specialised to find a female cell (egg cells) and join with it. They have tails‚ that makes them move in water to find and fertilize the female cell. They can move because they have many mitochondria located between the tail and the head‚ which gives them energy. In the head‚ there is a vacuole filled with acrosome‚ which is a specialized Lysosome that releases enzymes in order for the Sperm Cell to break into the Egg Cell‚ through the
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stem (IPS) cells differ from those currently in place for human embryonic stem (ES) cells. An IPS cell is created artificially from skin‚ fat and fibroblasts by reprogramming patient ’s own cells. Scientists believe IPS cells to be a promising source for treating diseases. An ES cell is created by destroying an embryo. Other scientists think ES cells will also be a promising source because it is composed of your own DNA‚ so the immune system won ’t reject the cell. While scientists would agree that
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ROD CELLS Rod cells‚ or rods‚ are photoreceptor cells in the retina of the eye that can function in less intense light than the other type of visual photoreceptor‚ cone cells. Rods are concentrated at the outer edges of the retina and are used in peripheral vision. On average‚ there are approximately 125 million rod cells in the human retina.[1] More sensitive than cone cells‚ rod cells are almost entirely responsible for night vision. STRUCTURE AND FUNCTION Rods are a little longer and leaner
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cellular telephone‚ or cell phone) is an electronic device used for two-way radio telecommunication over a cellular network of base stations known as cell sites. Mobile phones differ from cordless telephones‚ which only offer telephone service within limited range through a single base station attached to a fixed land line‚ for example within a home or an office. Today‚ cell phones are the most popular tool for communication in modern life. They become a “must have” that everybody cannot
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