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IB Biology SL 3.1.8 Nerves as Bundles

Practise identifying nerves as bundles of fibres, tracing sensory and motor pathways, and explaining how the vagus nerve carries parasympathetic signals to stomach glands.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Trace sensory and motor fibres through a nerve bundle and distinguish a nerve from a single neuron.
  • Explain how vagus-nerve impulses reach stomach glands and trigger parasympathetic secretion.

C3.1.8—Nerves as bundles question 1

[Maximum number: 1]

Numerous health benefits are associated with diets that include omega- 6 fatty acids and omega-3 fatty acids in a ratio between 1: 1 and 4: 1. When consumed in excess, omega-6 inhibits uptake of omega-3. Many people in developed countries eat large amounts of processed foods and oils, so they consume omega-6 fatty acids and omega-3 fatty acids at a ratio of between 10: 1 and 25: 1. Such high ratios are associated with many chronic diseases.

Table for Question C3.1.8—Nerves as bundles question 1 — IB Biology SL

State the role of the vagus nerve.

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