BIOL1- AQA A-Level Biology Unit 1

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1. What is the only limitation of the TEM that doesn't also apply to the SEM?

  • Image may contain artefacts
  • The specimen needing to be thin
  • Living specimens can't be observed
  • Complex staining process required
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2. What are the tracheal walls made of?

  • Muscle lined with ciliated epithelium and goblet cells
  • Muscle lined with epithelial cels
  • Collagen and elastic fibres
  • A series of highly branched tubules

3. Why are the lungs located inside the body?

  • Air isn't dense enough and they'd lose too much water outside the body
  • Air isn't dense enough and they'd flood with water outside the body
  • Air is too dense and they'd flood with water outside the body
  • Air is too dense and they'd lose too much water outside the body

4. Name the layer of non-conductive tissue that prevents the wave of electrical activity crossing to the ventricles?

  • Atrioventricular septum
  • Bundle of His
  • Sinoatrial node
  • Atrioventricular node

5. When the diaphragm contracts and flattens in inhalation, what does this lead to?

  • A decrease in the volume of the thorax
  • An increase in the pressure in the thorax
  • An increase in the volume of the thorax
  • An increased heart rate

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