Key term
Edexcel GCSE Combined Science Biology 1SC0
Key Concepts in Biology
Topic overviewEukaryotic and prokaryotic cellsSpecialised cells and their adaptationsMicroscopes and magnification calculationsSize, scale and units in cell biologyEnzyme action and denaturationFactors affecting enzyme activityEnzymes in synthesis and digestion, and rate calculationsDiffusion, osmosis and active transportOsmosis in potatoes and percentage change in mass
Cells and Control
Genetics
Topic overviewMeiosis and the formation of gametesDNA structure, genes and the genomeExtracting DNA from fruitAlleles, genotype and phenotypeMonohybrid crosses and sex determinationProbability and ratios from genetic crossesCauses of variation: genes and environmentThe Human Genome ProjectGenetic variation and the effects of mutation
Natural Selection and Genetic Modification
Health, Disease and the Development of Medicines
Topic overviewHealth, disease and susceptibilityPathogens and common infectionsHow pathogens spread, and the virus life cycleSexually transmitted infectionsPhysical barriers and chemical defencesThe immune system, immunisation and herd immunityAntibiotics and developing new medicinesLifestyle factors and non-communicable diseaseTreatments for cardiovascular disease
Plant Structures and Their Functions
Animal Coordination, Control and Homeostasis
Exchange and Transport in Animals
Topic overviewWhy multicellular organisms need exchange surfacesAlveoli and gas exchangeThe blood and its componentsArteries, veins and capillariesThe heart and the circulatory systemCellular respiration as an exothermic reactionAerobic and anaerobic respiration comparedInvestigating the rate of respirationCardiac output, stroke volume and heart rate
Ecosystems and Material Cycles
Exchange and Transport in Animals
The heart and the circulatory system
- 3 things to know
- Paper 2
Overview
The four chambers of the heart and why their walls differ in thickness, the vena cava, pulmonary artery, pulmonary vein and aorta, valves, the route from the right atrium to the lungs, the double circulation, and the coronary arteries that supply the heart muscle.
What you need to know
Answer each one before you reveal it.
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Key term
Name the four chambers of the heart.
Key term
Explain why the wall of the left ventricle is thicker than the wall of the right ventricle.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Name the four chambers of the heart.
Model answer
The right atrium, the right ventricle, the left atrium and the left ventricle.
- 2
Explain why the wall of the left ventricle is thicker than the wall of the right ventricle.
Model answer
The left ventricle pumps blood all the way round the body, which needs far more force than pumping to the lungs.
- 3
Explain why the atria have much thinner walls than the ventricles.
Model answer
The atria only push blood a short distance into the ventricles just below them.
- 4
Name the vessel that brings deoxygenated blood from the body into the heart.
Model answer
The vena cava.
- 5
Name the vessel that carries blood from the heart to the lungs.
Model answer
The pulmonary artery.
- 6
Name the vessel that returns oxygenated blood from the lungs to the heart.
Model answer
The pulmonary vein.
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