Key term
Eduqas A-Level Biology A400QS
Biological Molecules
Cell Structure and Organisation
Cell Membranes and Transport
Enzymes
Nucleic Acids and Their Functions
Importance of ATP
Photosynthesis
Respiration
Microbiology
Population Size and Ecosystems
Topic overviewPopulation growth and its measurementThe population growth curve and carrying capacityDensity dependent and density independent factorsSampling abundance and distributionEcosystems, habitats and communitiesEnergy transfer and pyramids of biomassSuccessionDecomposition and the carbon cycleThe nitrogen cycle and human interventionEutrophication and the effects of drainage
Human Impact on the Environment
Classification and Biodiversity
Topic overviewThe need for classification and the taxonomic hierarchyThe three domain and five kingdom systemsCharacteristic features of the five kingdomsAssessing relatedness by physical features and biochemistryThe species concept and the binomial systemBiodiversity, adaptation and natural selectionMeasuring biodiversity in a habitatGenetic and molecular measures of biodiversity
Mitosis and Meiosis
Sexual Reproduction in Humans
Sexual Reproduction in Plants
Inheritance
Variation and Evolution
Application of Reproduction and Genetics
Topic overviewThe Human Genome Project, other sequenced genomes and genomics in healthcareScreening embryos, stem cells and the ethical issuesGenetic fingerprinting, PCR and electrophoresis in forensic workRecombinant DNA and the production of human insulinGenetically modified crops and gene therapy
Adaptations for Gas Exchange
Topic overviewSurface area to volume ratio and gas exchange in small organismsSpecialised respiratory surfaces and the need for ventilationGills and counter current flow in bony fishThe human breathing system and its histologyVentilation and gas exchange in humansThe insect tracheal systemThe angiosperm leaf, stomata and gas exchange
Adaptations for Transport
Topic overviewVascular systems compared across animal groupsThe mammalian heart and blood vesselsThe cardiac cycle and its controlBlood, haemoglobin and dissociation curvesThe Bohr effect, chloride shift and tissue fluidThe root and the uptake of waterThe endodermis and the entry to the xylemXylem, transpiration and cohesion-tensionThe potometer and xerophytes and hydrophytesPhloem and translocation
Adaptations for Nutrition
Homeostasis and the Kidney
The Nervous System
Immunology and Disease: Disease and Its TransmissionImmunology
Immunology and Disease: AntibioticsImmunology
Immunology and Disease: The Immune ResponseImmunology
Human Musculoskeletal Anatomy: Skeletal TissuesMusculoskeletal
Topic overviewCartilage and its three typesThe composition and functions of compact boneBone remodelling and the Haversian systemRickets, osteomalacia, osteoporosis and brittle bone diseaseThe structure of skeletal muscleThe sliding filament theoryFast and slow twitch fibres, and energy for contraction
Human Musculoskeletal Anatomy: Structure and Function of the SkeletonMusculoskeletal
Human Musculoskeletal Anatomy: JointsMusculoskeletal
Neurobiology and Behaviour: The BrainNeurobiology
Neurobiology and Behaviour: NeuroscienceNeurobiology
Homeostasis and the Kidney
- 5 subtopics
- 15 things to know
- Component 3
What Homeostasis and the Kidney covers
Homeostasis and the Kidney is examined in Component 3, Requirements for Life. It covers homeostasis and feedback, the structure of the kidney and the nephron, ultrafiltration and selective reabsorption, water regulation and antidiuretic hormone and excretory products, adaptation and kidney failure.
Where it is assessed
Component 3
Requirements for Life, the compulsory section of the paper.
Check the Eduqas specification ↗The 5 subtopics
Each one has its own page.
- Homeostasis and feedbackDynamic equilibrium, four conditions that are homeostatically controlled in a mammal and components of a homeostatic control system.Open →
- The structure of the kidney and the nephronThree regions seen in a kidney cut in longitudinal section, renal artery and parts of a nephron in order.Open →
- Ultrafiltration and selective reabsorptionThree layers a substance crosses during ultrafiltration, three substances present in the glomerular filtrate and two components of blood that are not filtered.Open →
- Water regulation and antidiuretic hormoneRole of the ascending limb of the loop of Henlé, role of the descending limb and countercurrent multiplier.Open →
- Excretory products, adaptation and kidney failureThree nitrogenous excretory products found in animals, two causes of kidney failure and three consequences of kidney failure.Open →
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Describe the response to dehydration.
Key term
What is homeostasis?
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Name the three regions seen in a kidney cut in longitudinal section.
Key term
What is ultrafiltration?
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What is excretion?
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What is meant by dynamic equilibrium?
Key term
What is the renal artery, and what does it carry?
Key term
Name the three layers a substance crosses during ultrafiltration.
Key term
Name the three nitrogenous excretory products found in animals.
Key term
Name four conditions that are homeostatically controlled in a mammal.
Key term
What does the renal vein carry?
Key term
What are podocytes?
Key term
Which part of the nephron creates the conditions for water reabsorption?
Evaluation
Which animals excrete uric acid, and what is its advantage?
Take Homeostasis and the Kidney further
The same content, four other ways.
Questions from this topic
Each one with the model answer underneath.
- 1
What is homeostasis?
Model answer
The maintenance of a constant internal environment within narrow limits despite changes outside the organism.
- 2
What is meant by dynamic equilibrium?
Model answer
A condition held about a set point by continuous adjustment rather than by nothing changing.
- 3
Name four conditions that are homeostatically controlled in a mammal.
Model answer
Body temperature, blood glucose concentration, blood water potential and blood pH.
- 4
Why must enzymes be given a constant internal environment?
Model answer
Their activity depends on temperature and pH, and outside a narrow range they work too slowly or are denatured.
- 5
Name the components of a homeostatic control system.
Model answer
A receptor that detects the change, a co-ordinator, an effector that acts, and feedback of the result to the receptor.
- 6
What is a set point?
Model answer
The value at which a condition is held, and against which the receptor compares the actual value.
What is inside Levo
Six ways to work the same material.
Homeostasis and the Kidney revision questions
- What does Homeostasis and the Kidney cover in Eduqas A-Level Biology?
- 5 subtopics: homeostasis and feedback, the structure of the kidney and the nephron, ultrafiltration and selective reabsorption, water regulation and antidiuretic hormone and excretory products, adaptation and kidney failure. Each one has its own page with questions and model answers.
- How is Homeostasis and the Kidney organised?
- By the Eduqas A400QS specification, subtopic by subtopic, so it matches the order you are taught it in.
Every question in Homeostasis and the Kidney, on a schedule.
Attempt a question from memory, write the correct version, then attempt it again. Levo records the jump between your first attempt and your last, and brings each question back on the day you are due to forget it.
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