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 blood and its components
- 3 things to know
- Paper 2
Overview
Red blood cells, haemoglobin and oxyhaemoglobin, their biconcave shape and lack of a nucleus, phagocytes and lymphocytes, plasma and what it carries, platelets and clotting, estimating cell numbers per cubic millimetre, and pie chart angles and percentages for the parts of a blood sample.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
State the function of red blood cells.
Key term
Name the red pigment inside a red blood cell that binds oxygen.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Name the four main components of blood.
Model answer
Red blood cells, white blood cells, plasma and platelets.
- 2
State the function of red blood cells.
Model answer
Red blood cells carry oxygen from the lungs to respiring cells.
- 3
Name the red pigment inside a red blood cell that binds oxygen.
Model answer
Haemoglobin binds the oxygen.
- 4
Name the substance formed when haemoglobin binds oxygen in the lungs.
Model answer
Oxyhaemoglobin is formed.
- 5
Explain how the biconcave disc shape of a red blood cell suits its function.
Model answer
The shape increases the surface area for oxygen to diffuse across and shortens the distance oxygen travels into the cell.
- 6
Explain why a mature red blood cell has no nucleus.
Model answer
Losing the nucleus leaves more room for haemoglobin, so the cell can carry more oxygen.
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