Satsrevision
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The document contains a revision quiz on various topics related to biology and chemistry. It includes questions about plant and animal cell structure and function, food groups, digestion, respiration, circulation, reproduction, genetics, ecosystems and chemical reactions. The quiz contains over 100 multiple choice and short answer questions testing knowledge across many areas of science.
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The document summarizes the control of the heartbeat. The sinoatrial node (SAN) located in the right atrium acts as the pacemaker and initiates electrical signals that cause the atria to contract. The atrioventricular node (AVN) located between the atria and ventricles briefly delays the signal to allow the atria to empty before ventricular contraction. The purkinje fibers then transmit the signal to the ventricle walls to cause synchronized contraction from bottom to top, pumping blood out of the heart.
microbes and disease
Microbes such as bacteria, viruses, and fungi can cause disease in humans. Important scientists like Ignaz Semmelweiss, Louis Pasteur, and Joseph Lister helped discover that microbes were the cause of diseases and developed practices like hand washing and sterilization to prevent their spread. The human body also has natural defenses against microbes like skin, mucus, stomach acid, white blood cells, and the ability to develop antibodies from vaccines or previous exposures that provide protection.
Energy Transfer In Reactions
The document discusses energy transfer in chemical reactions. It explains that exothermic reactions release energy, often as heat, while endothermic reactions absorb energy from their surroundings. It also describes how reactions involve breaking bonds between atoms in reactants and forming new bonds between atoms in products. Breaking bonds requires energy and making bonds releases energy, so exothermic reactions release more energy in bond formation than is needed for bond breaking, while endothermic reactions require more energy for bond breaking than is released in bond formation.
Courseworkrequirements
The document provides guidelines for students completing a science coursework assignment on a topic related to science in the news. Students must research the topic in lesson time using supplied resources and are allowed to bring notes to the supervised writing session but not completed work. They have one hour to write a 800-word report answering the given question and must cite all sources used. Reports will be assessed on skills like selecting evidence, data analysis, and relating findings to social issues.
Chromatography
This document discusses chromatography and poses questions about separating mixtures of colors. It asks what solvent and solute were used, what other solvents and solutes could be tested, how to fairly compare different inks and ensure an experiment is repeatable, and how the experiment could be improved. It also asks what would happen if waterproof ink was used and why some dye travels further than others.
Heat Transfer Quiz
The document is a heat transfer quiz containing 10 multiple choice questions about different heat transfer processes including conduction, convection, radiation, and properties of good conductors and radiators. Key terms covered include how radiation travels as waves, how silvering in a flask prevents heat loss by radiation, how black objects are good radiators while shiny objects are good reflectors, and examples of processes using different heat transfer methods like convection and conduction.
Pawelphyschem
Physical evidence includes marks and impressions like footprints and tool marks, as well as trace evidence like fibers, glass, and paint. Analysis of these can provide clues about what happened during a crime. Footprints and toolmarks can be lifted like fingerprints for analysis. Fibers come in different types and shapes that can be identified. Different types of glass can be identified by their color, density, and refractive index. Blood spatter patterns depend on factors like size, direction, and force, and can reveal details about what took place. Chemical evidence includes substances like paint, drugs, and ink that can be analyzed to gain information about a crime. Chromatography and other techniques are used to identify chemicals and substances. Paint analysis examines color
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