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C3.1.5—The spinal cord as an integrating centre for unconscious processes

Experiments

Here are experiments our science specialists have selected to support this IB* topic.

Simple Neuromuscular Reflexes

Experiment #4 from Human Physiology Experiments

  • Graph the electrical activity of a muscle activated by a reflex arc through nerves to and from the spinal cord.
  • Compare the relative speeds of voluntary and reflex muscle activation.
  • Associate muscle activity with involuntary activation.
  • Observe the effect of central nervous system influence on reflex amplitude.
  • Calculate the approximate speed of a nerve impulse.
  • Compare reflex response and electrical amplitude in different subjects.

Educational Standard
International Baccalaureate (IB) 2025
Subject
Biology
Theme
C Interactions and interdependence
Level of organization
3 Organisms
Topic
C3.1 Integration of body systems
Section
Standard level and higher level

* The IB Diploma Program is an official program of the International Baccalaureate Organization (IBO) which authorizes schools to offer it. The material available here has been developed independently of the IBO and is not endorsed by it.

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