Vernier Software and Technology
Vernier Software & Technology

Neuromuscular Reflexes (with Accelerometer)

Figure from experiment 14A from Human Physiology with Vernier

Introduction

The automatic response of a muscle to a stimulus is called a reflex. The patellar reflex results from tapping the patellar tendon below the knee with a reflex hammer. This causes contraction of the quadriceps muscle and extension of the leg. Stretching of the muscle activates nerve impulses which travel to the spinal cord. Here the incoming impulses activate motor neurons, which travel back to the muscle and result in muscle contraction. This reflex arc is primarily a spinal reflex, but is influenced by other pathways to and from the brain.

Objectives

In this experiment, you will

  • 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.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Human Physiology with Vernier »

Experiment 14A from Human Physiology with Vernier Lab Book

<i>Human Physiology with Vernier</i> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

Buy the Book

Go to top