Syllabus Cambridge O Level Biology Syllabus code 5090 For examination in June and November 2011 Note for Exams Officers: Before making Final Entries‚ please check availability of the codes for the components and options in the E3 booklet (titled “Procedures for the Submission of Entries”) relevant to the exam session. Please note that component and option codes are subject to change. Contents Cambridge O Level Biology Syllabus code 5090 1. Introduction ............................
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My Journey Through the Human Body My name is Ruby; I am a red blood cell. I am a dazzling ruby red color (hence my name) with a small area of inner pallor and I am very small: only about 6 µm in diameter. I get my red color from a protein chemical called hemoglobin‚ which is bright red. Hemoglobin not only gives me my beautiful color‚ it also contains the element iron‚ which makes it a good vehicle for transporting oxygen and carbon dioxide. I have a very important role in the circulatory system
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Rob the Red Blood Cell Rob is an ordinary bllod cell and does the same thing every day. This is not a boring life though as he get the thrills of the lumps and bumps of the circulatory system. Rob enters the Vena Cava and enters the right Atrium where he is then pushed through the Tricuspid Valve and into the right Ventricle. While in her he currently has no oxygen in his biconcave dome so he needs to go and get some. He goes through the Pulmonary Valve and up and out of the Pulmonary
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1.5 Constructing Your Health Decisions 1. For your assignment you will organize information to include influences on your health‚ a family member’s health or the health of another person. Be sure to include: at least two examples of different influences by media‚ technology‚ or public policy on you‚ your family‚ or community the effect of these influences on everyone’s health the responsibility a person has for enhancing one’s health. 2. Use the organizer below to help you brainstorm your
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Introduction Every cell is selectively permeable to different molecules. This type of selectively is caused by a semi-permeable membrane‚ which allows the movement of certain molecules across it. Water exchange can be measured in two ways: RBC osmotic permeability is measured‚ and diffusional water permeability is measured (Benga and Borza 1995). Diffusion is the movement of high concentration to low concentration. The diffusion of water across a permeable membrane is called osmosis. Water concentration
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influenced osmosis in relation to three onion cells and the impact on the cells structure. A small square of a red onion skin (membrane) was observed under a microscope at high power (X40) magnification. The observation showed a large number of onion cells. The structure of one onion cell had a general rectangular shape with a developed cell wall‚ which gives the rectangular shape to the cell and a cell membrane just beneath it. The observation under the microscope of a cell of an onion
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Blood Cells Leukocytes (WBC’s) Leukocytes also known as white blood cells (WBCs) are cells which play a defensive roll in the body against injury and infection. They migrate towards tissues where they are needed and become functional performing various activities. WBCs can be divided into 2 groups: Polymorphonuclear granulocytes and mononuclear agranulocytes. Both types are spherical while suspended in blood plasma but when they invade tissues after leaving the blood vessels they become amoeboid
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Ben Zaré 9MK Biology Investigation - Osmosis in Potato Cells 9/7/04 Section 1 Planning Aim What is the aim of your experiment? What do you want to find out? The aim of this experiment is to investigate how potato tissue changes when placed in sucrose solution of different concentrations. Therefore‚ I want to find out if and how osmosis differs‚ when the concentration is changed. Variables What is the variable you are going to change in the experiment?
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Osmosis using potato cores and sucrose solution 1.0 Abstract This experiment’s ultimate goal is to find the water potential of the potato cell. This was achieved through placing potato cores in different concentrations of sucrose (0.2%‚ 0.4%‚ 0.6%‚ 0.8%‚ 1.0%‚ 2.0%‚ 3.0% and 4.0%) solution and to observe how much water was gained or lost through osmosis to reach a prediction of the concentration within the potato cell. The results displayed that the concentration of sucrose within the potato cell
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Journey of a Red Blood Cell The Circulatory System is the main transportation for the body‚ made up of blood vessels‚ the blood and the heart. The blood is comprised of the red blood cells‚ white blood cells (lymphocytes and phagocytes which make up part of the immune system‚ engulfing invading pathogens)‚ platelets which help the blood to clot preventing infection all transported around the vessels amongst the plasma. The blood plasma contains dissolved substances including carbon dioxide‚ urea
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