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Combined Science: Biology

GCSE · Edexcel · foundation

QuestionsFlashcards

Disease
Defence Against Disease
Development of Medicines
- Antibiotics
  4
- Discovery & Development of New Drugs
  3
Non-Communicable Diseases
- Lifestyle & Non-Communicable Disease
  7
- Cardiovascular Disease
  6

The Organism in the Environment
Human Influences on the Environment
- Human Impact on Biodiversity
  6
- Benefits of Maintaining Biodiversity
  4
Cycles within Ecosystems

The Blood & Blood Vessels Flashcards

All 9 cards in this deck

How is a red blood cell adapted to carry oxygen?: Biconcave disc shape (large surface area for absorbing oxygen), no nucleus (more room for haemoglobin) and packed with haemoglobin, which binds oxygen.
What is the function of a phagocyte?: It engulfs and digests pathogens.
What is the function of platelets?: They make the blood clot at a wound, sealing it to stop blood loss and keep pathogens out.
Why is the wall of an artery thicker and more muscular than the wall of a vein?: Because the blood pressure in an artery is higher — the thick, muscular wall prevents the artery bursting and maintains blood pressure.
Why do veins have valves?: To stop backflow of blood and keep it flowing in one direction towards the heart, because the blood pressure in veins is low.
What feature of a capillary wall allows substances to pass quickly between the blood and the cells?: Its wall is only one cell thick, giving a short diffusion distance.
What is the function of a lymphocyte?: It produces antibodies that destroy pathogens.
Name four substances transported in blood plasma.: Carbon dioxide, urea, hormones and dissolved food molecules (e.g. glucose).
Which type of blood vessel carries blood away from the heart, and which carries blood back to it?: Arteries carry blood away from the heart; veins carry blood back to the heart.