GCSE Science (Synergy Higher) AQA
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192 topics in 9 modules
☑️ Homeostasis 20 topics
- Introduction to Homeostasis
- The Human Nervous System: How It Works
- Reflex Actions
- Structure and Functions of the Brain
- The Eye: Structure and Functions
- Hormones and the Endocrine System
- Negative Feedback Mechanism in Homeostasis
- The Role of the Kidneys in Homeostasis
- Hormonal Control of Blood Glucose Levels
- Hormonal Control of the Menstrual Cycle
- Hormonal Methods of Contraception
- Mechanism of Thermoregulation
- Understanding Plant Hormones and Tropisms
- Identifying and Managing Plant Diseases
- Hygiene and Preventing Spread of Diseases
- Disorders Associated with the Nervous System
- Impact of Drugs on the Nervous System
- Managing Type 1 and Type 2 Diabetes
- Lifestyle Factors Impacting Homeostasis
- Investigations and Case Studies on Homeostasis
☑️ Building Blocks 21 topics
- States of Matter: A Particle Model
- States of Matter: Density
- States of Matter: Gas Pressure
- States of Matter: Heating and Changes of State
- States of Matter: Meanings of Purity
- Scientific Models of the Atom
- The Size of Atoms
- Sub-atomic Particles
- Atomic Structure: Isotopes
- Electrons in Atoms
- Electron Microscopy
- Cell Structures
- Transport Into and Out of Cells
- Mitosis and the Cell Cycle
- Meiosis
- Cell Differentiation
- Transverse and Longitudinal Waves
- Wave Equations
- Electromagnetic Waves
- Radio Waves
- Reflection and Refraction of Electromagnetic Waves
☑️ Transport over Larger Distances 15 topics
- Human Body: Respiration
- Human Body: Exchange Surfaces
- Human Body: Circulatory System
- Human Body: Blood Cells
- Human Body: Digestive System
- Human Body: Nervous System
- Human Body: Endocrine System
- Plants and Photosynthesis: Meristem Tissue
- Plant Structures
- Plants and Photosynthesis: Transpiration
- Chlorophyll and Other Plant Pigments
- Photosynthesis
- Factors Affecting the Rate of Photosynthesis
- Plants and Photosynthesis: Translocation
- Plant Diseases
☑️ Interactions with the Environment 25 topics
- Lifestyle and Health: Health and Disease
- Lifestyle and Health: Risk Factors for Non-Communicable Diseases
- Lifestyle and Health: Treatments for Cardiovascular Disease
- Lifestyle and Health: Homeostasis
- Lifestyle and Health: Insulin and Diabetes
- Lifestyle and Health: Human Reproductive Hormones
- Lifestyle and Health: Contraception
- Lifestyle and Health: Treatments for Infertility
- Absorption and Emission of Radiation
- Radioactive Decay
- Radiation and Risk: Half-Life
- Penetration Properties of Radiations
- Radiation and Risk: Contamination and Irradiation
- Radiation and Risk: Ionising Radiations
- Radiation and Risk: Cancer
- Spread of Communicable Diseases
- Human Communicable Diseases
- Defences Against Pathogens
- Diseases: The Human Immune System
- Diseases: Vaccination
- Diseases: Medicines
- Diseases: Testing New Drugs
- Diseases: Genetic Modification
- Diseases: Stem Cells
- Diseases: Interactions between Different Types of Disease
☑️ Explaining Change 25 topics
- Development of the Earth's Atmosphere
- Earth's Atmosphere: The Carbon Cycle
- Earth's Atmosphere: The Greenhouse Effect
- Earth's Atmosphere: Human Impacts on the Climate
- Earth's Atmosphere: Climate Change - Impacts and Mitigation
- Earth's Atmosphere: Pollutants that Affect Air Quality
- Earth's Atmosphere: The Water Cycle
- Earth's Atmosphere: Sources of Potable Water
- Ecosystems and Biodiversity: Levels of Organisation in an Ecosystem
- Ecosystems and Biodiversity: Interdependence and Competition
- Ecosystems and Biodiversity: Factors that Affect Communities
- Ecosystems and Biodiversity: Field Investigations
- Biodiversity
- Negative Human Impacts on Ecosystems
- Positive Human Impacts on Ecosystems
- Inheritance: Chromosomes and Genes
- Inheritance: Sex Determination in Humans
- Inheritance: Single Gene Inheritance
- Inheritance: Genotype and Phenotype
- Variation and Evolution: Mutations
- Evolution through Natural Selection
- Evidence for Evolution
- Variation and Evolution: Identification and Classification of Living Things
- Variation and Evolution: Selective Breeding
- Variation and Evolution: Genetic Engineering
☑️ Building Blocks for Understanding 11 topics
- Atomic Number and the Periodic Table
- The Periodic Table: Metals and Non-Metals
- The Periodic Table: Group 0
- The Periodic Table: Group 1
- The Periodic Table: Group 7
- Chemical Quantities: Chemical Equations
- Chemical Quantities: Conservation of Mass
- Chemical Quantities: Relative Formula Masses
- Chemical Quantities: Amounts of Moles
- Chemical Quantities: Calculations Based on Equations
- Chemical Quantities: Concentrations of Solutions
☑️ Interactions over Small and Large Distances 20 topics
- Forces and Energy Changes: Forces as Vectors
- Forces and Energy Changes: Resolving Forces
- Forces and Energy Changes: Work
- Forces and Energy Changes: Mass and Weight
- Forces and Energy Changes: Gravitational Potential Energy
- Forces and Energy Changes: Elastic Deformation
- Forces and Energy Changes: Energy Stored in a Stretched Spring
- Structures and Bonding: Types of Chemical Bonding
- Structures and Bonding: Ionic Bonding
- Structures and Bonding: Properties of Ionic Compounds
- Structures and Bonding: Covalent Bonding
- Structures and Bonding: Properties of Substances with Covalent Bonding
- Structures and Bonding: Metallic Bonding
- Structures and Bonding: Properties of Metals
- Magnets
- Magnetic Fields
- The Earth's Magnetism
- The Magnetic Effect of an Electric Current
- The Motor Effect
- Electric Motors
☑️ Movement and Interactions 39 topics
- Forces and Motion: Speed and Velocity
- Forces and Motion: Distance, Speed and Time
- Forces and Motion: Circular Motion
- Forces and Motion: Free Fall
- Newton's First Law
- Newton's Second Law
- Newton's Third Law
- Forces and Motion: Momentum
- Forces and Motion: Kinetic Energy
- Forces and Motion: Stopping Distances
- Electricity: Electric Current
- Electricity: Current, Resistance and Potential Difference
- Electricity: Series and Parallel Circuits
- Electricity: Circuit Elements
- Electricity: Direct and Altering Currents
- Electricity: Mains Cables
- Electricity: Power
- Electricity: Power and Domestic Electric Appliances
- Electricity: The National Grid
- Acids and Alkalis: Reaction of Acids
- Acids and Alkalis: Making Salts
- Acids and Alkalis: Energy Changes and Reactions
- Acids and Alkalis: The pH Scale and Neutralisation
- Acids and Alkalis: Strong and Weak Acids
- Chemical Change: Factors that Affect Reaction Rates
- Rates of Reaction: The Effect of Surface Area
- Rates of Reaction: The Effect of Temperature, Concentration and Pressure
- Chemical Change: Activation Energy
- Chemical Change: Bond Breaking and Forming
- Chemical Change: Catalysts
- Chemical Change: Enzymes
- Chemical Change: Reversible Reactions
- Chemical Change: Dynamic Equilibrium
- Chemical Change: Factors Affecting the Position of Equilibrium
- Atoms and Ions: A Reactivity Series for Metals
- Atoms and Ions: Electrolysis
- Atoms and Ions: Electrolysis of Aqueous Solution
- Atoms and Ions: Tests for Gases
- Atoms and Ions: Electron Transfer Reactions
☑️ Guiding Spaceship Earth towards a Sustainable Future 16 topics
- Carbon Chemistry: Bonding and Structure in Forms of Carbon
- Carbon Chemistry: Hydrocarbons in Crude Oil
- Carbon Chemistry: Fractional Distillation of Crude Oil
- Carbon Chemistry: Cracking Hydrocarbons
- Metal Extraction by Reduction of Oxides
- Metal Extraction by Electrolysis
- Metal Extraction by Biological Methods
- Materials and Energy: Energy Resources
- Materials and Energy: Energy Conservation and Dissipation
- Materials and Energy: Preventing Unwanted Energy Transfers
- Materials and Energy: Energy Efficiency
- Materials and Energy: Life Cycle Assessment
- Materials and Energy: Recycling
- Key Ideas: Biology
- Key Ideas: Chemistry
- Key Ideas: Physics
GCSE Science (Synergy Higher) AQA Revision Content
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GCSE Science (Synergy Higher) AQA - Homeostasis - Introduction to Homeostasis Content Preview
Homeostasis
Introduction to Homeostasis
Introduction to Homeostasis
Definition
- Homeostasis is a process used by many organisms to maintain a stable internal environment, despite changes in external conditions.
- This involves balancing inputs with outputs, and maintaining optimal conditions for cell functioning.
Importance of Homeostasis
- Homeostasis is crucial to support normal physiological activities and to handle stresses.
- It primarily controls three core aspects: the concentration of oxygen and carbon dioxide, the pH and the concentration of nutrients and waste products.
- Alterations to these aspects can lead to cell dysfunction or even death.
Mechanisms of Homeostasis
- Homeostatic control mechanisms have three interdependent components: a receptor, a control centre (or integrator) and an effector.
- The receptor detects changes in the conditions of the environment and sends the information to the control centre.
- The control centre processes the information and commands the effector to respond and restore the conditions to the norm.
- This process is known as a feedback loop. If the response decreases the original stimulus, it is termed a negative feedback loop. If the response increases the original stimulus, it is termed a positive feedback loop.
- Negative feedback loops are more common in nature and stabilise the system, while positive feedback loops are less common and usually exacerbate the system’s response.
Question: Explain the role of the receptor, control centre, and effector in a homeostatic feedback loop.
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