- The major functions of the cell is concentrated at the outer edges of the retina and are used in peripheral vision. On average‚ there are about 125 million rod cells in the human retina. Rod cells are almost entirely responsible for night vision. Rod cells do not process fine details or color differences‚ but are highly sensitive to light. A single flash of light is all that is require to produce a response from a rod cell. Rod cells function as specialized neurons that convert visual stimuli in
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Why do we have rods and cones? Light falling on photoreceptors is transformed by retinal circuitry into a pattern of action potentials that ganglion cell axons convey to the visual centres in the brain. Two systems of photoreceptors exist – rods and cones – allowing the visual system to meet the conflicting demands of sensitivity and acuity‚ respectively. Rods and cones are distinguished by shape‚ type of photopigment they contain‚ distribution across the retina‚ and pattern of synaptic connections
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about the restaurant. Nandos have added a bit of colour to their form whereas Topman have not. Topman’s application form was much more detailed as it tells you how to apply‚ there top level supervisors‚ visual merchandising assistants etc... In contrast to Nandos which does not include all these points and facts about their business. Comparisons: both application forms give information about the business such as what will be expected from you when you start working there and what you will learn
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Prokaryotic cells are single celled organisms that were formed at the formation of the earth‚ so are the most basic life forms. The prokaryotes are organised in the ‘three domain system’ and include bacteria and blue-green algae. Prokaryotes live in many environments including extreme habitats such as hydrothermal vents‚ hot springs‚ swamps‚ wetlands‚ and the guts of animals. This is a diagram of a prokaryote cell and it shows that they are not very complex cells. They do not contain any membrane
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CELL ULTRASTRUCTURE CELL ULTRASTRUCTURE Cells are the smallest functional units of the body‚ (Waugh‚ A. and Grant‚ A.2010). Most cells are microscopic. The largest cell in the body is the female ovum. The erythrocyte is the smallest cell. The longest cell is the neuron. Cells group together to form tissues‚ each of which has specialised function. Different tissues group together to form organs. Organs are group together to form organ systems‚ each of which performs a particular function that
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Compare the function of formats and locations in retailing I will now compare the different types of store types. The main store types that I believe are shopping centres‚ shopping malls and in town shopping. A shopping mall will have numerous of shops of all together where as intown shopping centres will have high street and local shops in them. Chimes centre is in Uxbridge which is an example of intown shopping centre. Also Blue water in Kent is an example of a shopping mall. Both
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Eukaryotic cells were known to have many differences in structure and content with prokaryotic cells – exclusive organelles that can only be found in eukaryotic cells. Presumably‚ it was thought that eukaryotic cells have a more complex structure‚ whereas prokaryotes have fairly simple. Modern technology and understanding of differences between these two types of cells may help scientists to propose new hypotheses on eukaryotic and prokaryotic cells origins. Prokaryotes and eukaryotes have more
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structure of these cells is a flying disk shaped like a donut‚ this is so maximum haemoglobin can be carried allowing maximum amount of oxygen to be transported. Sperm cells A sperm cell is the male reproductive cell that carries the male portion of chromosomes and deoxyribonucleic acid (DNA) information to be fused with the female egg or ovum. The sperm cell carries various amount of heredity information inside the cell nucleus. There are various ways in which sperm can be transmitted to the
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Cells and our government are alike in many ways‚ both are made up of smaller components which work together to maintain a stable environment. The organelles can be compared to parts of our government in the way they work together. The nucleus is the main organelle in the cell‚ it makes rna and contains dna‚ this is similar to congress because they make laws which is similar to rna. The golgi apparatus packages carbohydrates and proteins into vesicles and export them out of the cell. This can be
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N11/4/CHEMI/SP2/ENG/TZ0/XX 88116105 CHEMISTRY STandaRd lEvEl PaPER 2 Monday 7 November 2011 (afternoon) 1 hour 15 minutes INSTRUCTIONS TO CANDIDATES • • • • • Candidate session number 0 0 Examination code 8 8 1 1 – 6 1 0 5 Write your session number in the boxes above. Do not open this examination paper until instructed to do so. Section A: answer all questions. Section B: answer one question. Write your answers in the boxes provided. 19 pages © International Baccalaureate Organization
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